From 7c06b27c73c8f7d6815f964f25fbfab94241dd25 Mon Sep 17 00:00:00 2001
From: Jared Vititoe <jjvititoe1@gmail.com>
Date: Tue, 30 Jun 2026 22:34:17 -0400
Subject: [PATCH] feat(call): in-call soundboard, quality controls, room
 call-permissions

Element Call is now consumed as our self-built fork
(@lotusguild/element-call-embedded); wire up its previously-dormant
capabilities and document the fork as live.

Soundboard (P5-15): a call-bar button plays user-uploaded audio clips into the
call as a real published track (io.lotus.inject_audio) plus local playback.
Clips are uploadable like emoji/sticker packs, stored in io.lotus.soundboard
account data (synced across devices). Gated by a Settings toggle + volume.

Quality controls (P5-31): per-user mic/screenshare bitrate + screenshare
framerate (Settings -> Calls), applied via io.lotus.set_quality clamped to any
room cap. Room admins set caps and hard call-permissions (allow_screenshare /
allow_camera) in Room Settings -> Voice; the call bar hides blocked buttons.

- New: CallSoundboard, useSoundboard, soundboardClips; RoomQuality,
  useCallQuality, callQuality (+ unit tests).
- Optimistic-write RoomQuality admin UI (no stale-state clobber).
- Docs: mark EC fork live across README/FEATURES/TODO/BUGS/TESTING; add D2
  manual-test steps.

Numeric quality caps are client-cooperative; screenshare/camera permissions are
hard-enforced server-side (see LotusGuild/matrix voice-limit-guard).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
---
 LOTUS_BUGS.md                                 |  51 ++--
 LOTUS_FEATURES.md                             | 126 ++++++++--
 LOTUS_TESTING.md                              |  55 ++++-
 LOTUS_TODO.md                                 | 110 +++++----
 README.md                                     |  31 +--
 src/app/components/CallEmbedProvider.tsx      |   2 +
 src/app/features/call/CallControls.tsx        |  50 ++--
 src/app/features/call/CallSoundboard.tsx      | 220 ++++++++++++++++++
 .../common-settings/general/RoomQuality.tsx   | 198 ++++++++++++++++
 .../features/common-settings/general/index.ts |   1 +
 .../room-settings/general/General.tsx         |   2 +
 src/app/features/settings/general/General.tsx |  94 ++++++++
 src/app/hooks/useCallQuality.ts               |  41 ++++
 src/app/hooks/useSoundboard.ts                | 101 ++++++++
 src/app/plugins/call/CallControl.ts           |  38 +++
 src/app/plugins/call/CallEmbed.ts             |   5 +
 src/app/state/settings.ts                     |  21 ++
 src/app/utils/callQuality.test.ts             |  60 +++++
 src/app/utils/callQuality.ts                  |  96 ++++++++
 src/app/utils/soundboardClips.ts              |  72 ++++++
 src/types/matrix/accountData.ts               |   4 +
 src/types/matrix/room.ts                      |   1 +
 22 files changed, 1259 insertions(+), 120 deletions(-)
 create mode 100644 src/app/features/call/CallSoundboard.tsx
 create mode 100644 src/app/features/common-settings/general/RoomQuality.tsx
 create mode 100644 src/app/hooks/useCallQuality.ts
 create mode 100644 src/app/hooks/useSoundboard.ts
 create mode 100644 src/app/utils/callQuality.test.ts
 create mode 100644 src/app/utils/callQuality.ts
 create mode 100644 src/app/utils/soundboardClips.ts

diff --git a/LOTUS_BUGS.md b/LOTUS_BUGS.md
index 9338f5a3f..603f15c02 100644
--- a/LOTUS_BUGS.md
+++ b/LOTUS_BUGS.md
@@ -39,38 +39,31 @@ Implemented and gate-green; confirm each per `LOTUS_TESTING.md`, then delete the
 
 ## 🧩 Element Call source-level items — now actionable via the fork
 
-> 🔱 **[EC-FORK]** **UPDATE 2026-06-29: the fork is live.** We now own and
+> 🔱 **[EC-FORK]** **UPDATE 2026-06-30: Phase 2 IMPLEMENTED.** We own and
 > self-build Element Call (`LotusGuild/element-call` →
-> `@lotusguild/element-call-embedded`, Phase 1 done & cinny wired). A5/A6/A7
-> below are **no longer "won't fix"** — they are ordinary source changes. See
-> [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md) §10 + the Phase
-> 2 work list. (The iframe is **same-origin** / self-hosted; the old blocker was
-> that we didn't own EC's compiled source — which we now do.)
+> `@lotusguild/element-call-embedded@0.20.1-lotus.1`, cinny wired). A5/A6/A7
+> below are **fixed in the fork** — they are now ⚠️ awaiting **live
+> verification** (`LOTUS_TESTING.md` §D2), not open work. See
+> [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md) §10. Delete each
+> row once verified live.
 
-The in-call participant grid is rendered **inside EC's app**. Previously a
-pre-built npm bundle we could only style/place around; now editable source.
-Items from testing, with their fork-level fix path:
+The in-call participant grid is rendered **inside EC's app** — now editable source
+(previously a prebuilt npm bundle we could only style around). Status of the items
+from testing:
 
-- **A5 — "Focus camera":** EC supports native tile-pinning. Our bottom-bar "Focus
-  camera" is a programmatic wrapper that **`.click()`s the tile** today
-  (`CallControl.ts` `focusCameraParticipant`), and during a screenshare EC
-  spotlights the shared screen so a camera pin may not override it. **Fork fix:**
-  add an `io.lotus.focus_participant` widget action that pins a participant in
-  EC's layout (coexisting with / overriding the screenshare spotlight); cinny
-  sends it via the widget API and the DOM-click hack is deleted. _Status: Open —
-  Actionable (Phase 2)._
-- **A6 — avatar decorations in-call:** decorations render on **our** pre-join
-  lobby roster (`CallMemberCard`) but not on EC's in-call video tiles. **Fork
-  fix:** render the decoration APNG inside EC's participant-tile component, fed
-  decoration slugs via widget member data. _Status: Open — Actionable (Phase 2)._
-- **A7 — mic dead after EC's "Reconnect":** the mid-call "Connection lost /
-  Reconnect" screen is **EC's own** (our load watchdog only covers an initial
-  hung load). After EC reconnects, the mic isn't re-published through our denoise
-  `getUserMedia` shim until a clean End+rejoin. **Fork fix:** move denoise into
-  EC's mic-capture/publish pipeline as a first-class audio stage — EC re-runs it
-  on every (re)publish, so reconnects keep denoise alive natively, and the
-  build-time `index.html` injection is removed. _Status: Open — Actionable
-  (Phase 2); root cause is the `getUserMedia` monkeypatch, not EC itself._
+- **A5 — "Focus camera": ⚠️ FIXED in fork, awaiting verify (D2-3).** cinny now
+  sends an `io.lotus.focus_participant` widget action that pins a participant in
+  EC's layout (coexisting with / overriding the screenshare spotlight); the old
+  `.click()`-the-tile DOM hack in `CallControl.ts` is deleted.
+- **A6 — avatar decorations in-call: ⚠️ FIXED in fork, awaiting verify (D2-4).**
+  cinny pushes `io.lotus.decorations` (per-user APNG URLs) and the fork renders
+  them on EC's participant video-tile avatars — not just our pre-join lobby roster.
+- **A7 — mic dead after EC's "Reconnect": ⚠️ FIXED in fork, awaiting verify
+  (D2-1).** Denoise moved into EC's mic-capture/publish pipeline as a first-class
+  LiveKit `TrackProcessor` (flag `lotusDenoiseSource=1`); EC re-runs it on every
+  (re)publish, so reconnects keep denoise alive natively. The build-time
+  `getUserMedia`/`index.html` injection (the root cause) is removed. **Highest
+  blast radius — everyone's mic; verify D2-1 carefully.**
 
 ---
 
diff --git a/LOTUS_FEATURES.md b/LOTUS_FEATURES.md
index b03ff2a3f..25a699c95 100644
--- a/LOTUS_FEATURES.md
+++ b/LOTUS_FEATURES.md
@@ -322,14 +322,104 @@ Users can set a custom background color for `@mention` chips that highlight thei
 
 ## Voice / Video Call Improvements
 
-> 🔱 **[EC-FORK]** Element Call is embedded as a **pre-built npm bundle** today.
-> The plan to fork & self-build it from source for true ownership — and which of
-> the items below would move into our EC source — is in
+> 🔱 **[EC-FORK] LIVE (2026-06).** Element Call is now our **self-built fork**
+> (`@lotusguild/element-call-embedded@0.20.1-lotus.1`, source at
+> `LotusGuild/element-call`), served same-origin — no longer the upstream
+> pre-built npm bundle. Several in-call behaviors below are now first-class
+> source changes rather than DOM/widget hacks. Background, plan, and the Phase-2
+> work list are in
 > [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md).
 
-### Element Call Upgrade
+### Element Call — Self-Built Fork (`0.20.1-lotus.1`)
 
-Upgraded embedded Element Call widget from **0.16.3** to **0.19.4**.
+The embedded widget was upgraded **0.16.3 → 0.19.4 → 0.20.1**, then **forked**.
+We self-build `LotusGuild/element-call` and publish it to our private Gitea npm
+registry as `@lotusguild/element-call-embedded`; cinny consumes that instead of
+`@element-hq/element-call-embedded`. The iframe prints
+`Element Call embedded-v0.20.1-lotus.1` in its console (vs. `embedded-v0.20.1`
+upstream) — the quickest way to confirm a deploy landed the fork.
+
+All custom behavior lives in the fork's `src/lotus/` modules and is **additive
+and dormant by default**, gated by URL flags / widget actions the host opts into,
+so a stock EC config is byte-for-byte upstream behavior.
+
+**Active (cinny drives them today):**
+
+| #   | Feature                           | Mechanism                                                                                                                               | Replaces (old hack)                                                                                                 |
+| --- | --------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- |
+| A7  | **Denoise in-source**             | ML noise suppression runs inside EC as a LiveKit `TrackProcessor<Audio>` (flag `lotusDenoiseSource=1`); re-applied on every (re)publish | the build-time `getUserMedia` monkeypatch injected into `index.html` — **removed**. Fixes mic-dead-after-reconnect. |
+| #2  | **Speaking / mute events**        | EC emits `io.lotus.call_state` (throttled); cinny reads speaker + mute state from it (flag `lotusCallState=1`)                          | scraping EC's DOM for `[data-lk-speaking]` (kept only as fallback)                                                  |
+| A5  | **Focus participant**             | host sends `io.lotus.focus_participant` to pin a tile, coexisting with / overriding the screenshare spotlight                           | the `.click()`-the-tile DOM hack in `CallControl.ts` — **removed**                                                  |
+| #6  | **In-call avatar decorations**    | host pushes `io.lotus.decorations` (per-user APNG URLs); the fork renders them on EC's video-tile avatars                               | previously impossible — decorations only showed on our pre-join lobby roster                                        |
+| #5  | **Native transparent background** | flag `lotusTransparent=1` makes EC's surface transparent so the host wallpaper shows through                                            | the injected `background:none !important` CSS                                                                       |
+
+**Now wired (cinny drives them — ⚠️ awaiting live verification):**
+
+| #     | Capability           | Widget action                                                                        | cinny surface                                                       |
+| ----- | -------------------- | ------------------------------------------------------------------------------------ | ------------------------------------------------------------------- |
+| P5-15 | **Audio inject**     | `io.lotus.inject_audio` — plays a clip into the call as a separately published track | In-Call Soundboard (uploadable clips) — see below                   |
+| P5-31 | **Quality controls** | `io.lotus.set_quality` — sets audio/screenshare encoding bitrate/framerate           | Call Quality Controls (user settings + room-admin caps) — see below |
+
+> Both were dormant capabilities; cinny now drives them (armed via
+> `lotusAudioInject=1`). The **only** EC item still open is the P5-31
+> **server-side** quality guard (a `voice-limit-guard`-style sidecar reading
+> `io.lotus.room_quality`) for hard enforcement across all Matrix clients — the
+> client cap is best-effort.
+
+### In-Call Soundboard (P5-15)
+
+A soundboard button (🔔) in the call controls bar opens a popout of the user's
+clips. Clicking one **injects it into the call as a real published LiveKit
+track** (every participant hears it, via the fork's `io.lotus.inject_audio`) and
+plays it locally for the presser (LiveKit doesn't loop your own track back).
+
+- **User-uploadable, like custom emoji/sticker packs.** Clips are stored in the
+  `io.lotus.soundboard` account data event, so they **sync across all your
+  devices**. Upload short audio (≤ 1 MB, ≤ 40 clips) from the popout; delete
+  inline.
+- Authenticated media can't be fetched from the widget's realm, so the host
+  resolves each mxc clip → an authenticated download → a same-session `blob:`
+  object URL and hands that to the widget.
+- Gated by the **Soundboard** toggle (Settings → General → Calls) with a volume
+  slider. The button is hidden when disabled.
+- Files: `utils/soundboardClips.ts`, `hooks/useSoundboard.ts`,
+  `features/call/CallSoundboard.tsx`, `plugins/call/CallControl.ts#injectAudio`.
+
+### Call Quality Controls (P5-31)
+
+Discord-style encoding controls applied to the local tracks via the fork's
+`io.lotus.set_quality` (`RTCRtpSender.setParameters` across all simulcast
+encodings, re-applied on every re-publish/reconnect).
+
+- **User settings** (Settings → General → Calls): Microphone Bitrate,
+  Screenshare Bitrate, Screenshare Framerate (each defaults to **Auto**).
+- **Room-admin caps**: admins set a ceiling in Room Settings → General → Voice
+  (`io.lotus.room_quality` state event); every Lotus client clamps its per-user
+  quality to `min(user setting, room cap)`.
+- Applied by the `useCallQuality` hook on join and whenever settings/caps
+  change; `utils/callQuality.ts` builds the payload (unit-tested).
+
+**Server-enforced call permissions (hard, ALL clients).** The same
+`io.lotus.room_quality` event carries a **publish-source policy**
+(`allow_screenshare`, `allow_camera`) enforced server-side by
+`voice-limit-guard` (matrix repo, LXC 151): it re-signs the LiveKit JWT's
+`canPublishSources`, so the SFU refuses screenshare/camera tracks for **every**
+Matrix client (Element, FluffyChat, our fork) — not just Lotus. Admins toggle
+these in Room Settings → Voice → **Call Permissions**; cinny also hides the
+blocked buttons in the call bar. Enforcement is **live**: the JWT re-sign covers
+new joins, and a background reconcile loop revokes an **in-progress**
+screenshare/camera (via LiveKit `UpdateParticipant`) within ~3 s of an admin
+flipping the policy — so it kills active shares mid-call, not just future ones.
+
+- **Why numeric caps aren't server-enforced:** LiveKit is a pure SFU (forwards,
+  never transcodes) and has no publisher bitrate/fps field anywhere in the JWT
+  grant, room config, server `limit:`, or admin API; stock Element Call ignores
+  room metadata for publish quality. Numeric caps are therefore inherently
+  **cooperative** — our fork honors them, which is the design above. The
+  publish-source policy is the one genuine hard, cross-client lever, and it's
+  implemented.
+- **Not yet**: screenshare resolution control (needs a `getDisplayMedia` hook in
+  the fork).
 
 ### Camera Default Off
 
@@ -431,20 +521,26 @@ A comprehensive mic noise-suppression system in **Settings → General → Calls
 - **Support Detection:** UI now detects `AudioWorklet` / `AudioContext` support and disables ML options in unsupported environments.
 - **Status Reporting:** The ML shim notifies the host app via `postMessage`. If initialization fails, a system toast alerts the user of the fallback to the raw microphone.
 
-**Open-Source Model Roadmap:**
-| Model | Transients (Clicks) | Voice Quality | CPU Usage (WASM) |
-| :--- | :--- | :--- | :--- |
-| **RNNoise** | Poor | Moderate | < 5% |
-| **DTLN** | Good | High | 10-20% |
-| **DeepFilterNet 3** | **Excellent** | **Very High** | 25-50%+ |
+**Open-Source Models (all now in-source in the EC fork):**
+| Model | Transients (Clicks) | Voice Quality | CPU Usage (WASM) | Sample rate |
+| :--- | :--- | :--- | :--- | :--- |
+| **RNNoise** (default) | Poor | Moderate | < 5% | 48 kHz |
+| **Speex** | Poor | Low | < 5% | 48 kHz |
+| **DTLN** | Good | High | 10-20% | 16 kHz |
+| **DeepFilterNet 3** | **Excellent** | **Very High** | 25-50%+ | 48 kHz |
 
-> **Note:** DeepFilterNet 3 is planned for future inclusion in the desktop build where larger binaries and higher CPU overhead are more acceptable.
+> **Update (2026-06):** with the EC fork live, denoise runs **inside** Element
+> Call as a LiveKit `TrackProcessor` and **all four models ship in-source**
+> (DTLN at 16 kHz, the rest at 48 kHz; the processor degrades to the raw mic
+> rather than ever going silent). The model picker selects between them. Real-call
+> **audio-quality** comparison across models is still the open verification item
+> (RNNoise output is known to be weak) — see `LOTUS_TESTING.md` §D2-1.
 
 ### Files
 
-- `build/lotus-denoise.js` — multi-model getUserMedia shim
-- `vite.config.js` — `lotusDenoise()` plugin (copies assets for RNNoise, Speex, and NoiseGate)
-- `src/app/plugins/call/CallEmbed.ts` — advanced tier → widget URL params
+- **EC fork** `src/lotus/lotusDenoise.ts` + `lotusDenoiseProcessor.ts` — in-source LiveKit `TrackProcessor` (RNNoise/Speex 48 kHz, DTLN 16 kHz, DeepFilterNet 48 kHz); activated by `lotusDenoiseSource=1`. (The old build-time `getUserMedia` shim `build/lotus-denoise.js` is **removed**.)
+- `vite.config.js` — `lotusDenoise()` plugin (now only **copies model assets** for the fork to load; no longer injects a shim)
+- `src/app/plugins/call/CallEmbed.ts` — advanced tier → `lotusDenoiseSource` widget URL param
 - `src/app/utils/lotusDenoiseUtils.ts` — support detection and model comparison metadata
 - `src/app/features/settings/general/General.tsx` — advanced settings UI + mic meter
 
diff --git a/LOTUS_TESTING.md b/LOTUS_TESTING.md
index 35866a27a..750036bb2 100644
--- a/LOTUS_TESTING.md
+++ b/LOTUS_TESTING.md
@@ -267,12 +267,59 @@ Flag: `lotusTransparent=1` (native, replacing the injected `background:none !imp
 - [ ] Call background looks right — host wallpaper/surface shows through; **no** black box, bad
       see-through, or layout breakage (also covered loosely by §D2 "looks right").
 
-### D2-6. Dormant features — confirm they do NOTHING (no regression)
+### D2-7. In-Call Soundboard (#3 / P5-15) — 👥 2 people — **NEW**
 
-EC ships the capability but cinny has **no UI** to trigger them yet:
+Flag: `lotusAudioInject=1`. A 🔔 **Soundboard** button now sits in the call controls bar (left group,
+next to the chat button). Clips are user-uploadable and sync across your devices like emoji packs.
+_Prereq:_ Settings → General → Calls → **Soundboard** must be ON (default on).
 
-- [ ] **Soundboard audio-inject (#3)** and **quality controls (#7)** — there should be no new UI and no
-      effect. (Nothing to test; noted so a tester doesn't go hunting.)
+- [ ] **Upload:** open the soundboard popout → **Upload** → pick a short audio file (mp3/ogg/wav, ≤ 1 MB).
+      It appears as a clip tile. (Too-big / too-many shows an error, doesn't crash.)
+- [ ] **Plays into the call:** with a second person in the call, click a clip. **They hear it**, and
+      **you hear it locally** too. ✅ good if both hear it; ❌ tell us if only one side does.
+- [ ] **Sync:** the uploaded clip shows up on your **other device**/session (account-data sync).
+- [ ] **Delete:** the ✕ on a tile removes it (everywhere, after sync).
+- [ ] **Off switch:** turn Settings → Calls → **Soundboard** off → the call-bar button disappears.
+- [ ] Injecting a clip does **not** mute/interrupt your mic or anyone else's audio.
+
+### D2-8. Call Quality Controls (#7 / P5-31) — 👥 2 people — **NEW**
+
+Action: `io.lotus.set_quality`. User settings in **Settings → General → Calls** (Microphone Bitrate,
+Screenshare Bitrate, Screenshare Framerate; all default **Auto**). Admin caps in **Room Settings →
+General → Voice → Call Quality Caps**.
+
+- [ ] **No regression at Auto:** with everything on **Auto**, calls/screenshare work exactly as before.
+- [ ] **User cap takes effect:** set Microphone Bitrate to **32 kbps**, rejoin/continue a call — audio
+      still flows (thinner is fine). Set Screenshare Framerate to **15 fps** and share your screen — it
+      still shares. ❌ tell us if any setting kills audio/screenshare.
+- [ ] **Applies mid-call:** changing a setting **during** a call takes effect without End+rejoin.
+- [ ] **Room-admin cap (admin needed):** as a room admin, set **Max Microphone Bitrate = 64 kbps** in
+      Room Settings → Voice. A member whose user setting is higher (e.g. 256) should be **clamped to 64**
+      (best-effort/UX — this is client-side; hard server enforcement is a separate follow-up).
+- [ ] Resetting a setting back to **Auto** removes the cap for the rest of the call.
+
+> Soundboard + quality are no longer "dormant" — if either does nothing, grab the **EC iframe console**
+> and check for `io.lotus.inject_audio` / `io.lotus.set_quality` rejections.
+
+### D2-9. Call Permissions — HARD server-side, cross-client (👥 2 people, admin) — **NEW**
+
+This is enforced by the `voice-limit-guard` on the server (re-signs the LiveKit JWT), so it applies to
+**every** client, not just Lotus Chat. Set in **Room Settings → General → Voice → Call Permissions**.
+_(Requires the guard deployed on LXC 151 — auto-deploys on a `matrix` repo push.)_
+
+- [ ] **Disable screenshare:** as admin, turn **Allow Screen Sharing** off. In a call, the
+      **screenshare button disappears** in Lotus Chat. ✅ good if no one can screenshare.
+- [ ] **Cross-client (the important one):** have someone join the **same room from stock Element / Element
+      X** and try to screenshare → the server **refuses** the track (it won't publish). This proves it's
+      not just our client hiding a button.
+- [ ] **Audio-only room:** turn **Allow Camera** off too → the camera button disappears and cameras are
+      server-blocked for all clients; **microphones still work**.
+- [ ] **⭐ Live kill (mid-call):** while someone is **actively screensharing**, an admin turns **Allow
+      Screen Sharing** off. Within a few seconds their screenshare should **stop for everyone** on its own
+      (no rejoin needed) — this is the server reconcile loop revoking it live. Works even if the sharer is
+      on stock Element. ✅ good if the share drops within ~3–5 s; ❌ tell us if it keeps going.
+- [ ] **Turning it back on** restores the ability to screenshare/camera (start a new share).
+- [ ] **No policy = no change:** a room with Call Permissions left on defaults behaves exactly as before.
 
 > If any D2 item fails, grab the **EC iframe console** (right-click the call → inspect the iframe) — a
 > widget-action/payload mismatch shows up there as a `io.lotus.*` rejection or a `MissingKey`/transport log.
diff --git a/LOTUS_TODO.md b/LOTUS_TODO.md
index 309b281a0..d5b8cf71d 100644
--- a/LOTUS_TODO.md
+++ b/LOTUS_TODO.md
@@ -48,6 +48,9 @@ Built and gate-green; verify per [LOTUS_TESTING.md](./LOTUS_TESTING.md), then th
 | Desktop — proactive update notifications (Tauri)                                  | J1                |
 | Remind Me Later                                                                   | K1                |
 | Mobile Bookmarks access                                                           | E5                |
+| In-Call Soundboard (P5-15, uploadable clips → real call inject)                   | D2-7              |
+| Call Quality Controls (P5-31, user + room-admin caps)                             | D2-8              |
+| Call Permissions (P5-31, hard server-side screenshare/camera policy)              | D2-9              |
 
 ---
 
@@ -72,32 +75,32 @@ Status: `[ ]` pending · `[~]` in progress · `[x]` completed
 
 ### Confirmed facts
 
-| Finding                                                                                                                                             | Impact                                                                         |
-| --------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------ |
-| **MSC flags ON:** `msc4140` · `msc3771` · `msc3440.stable` · `msc4133.stable` · `simplified_msc3575` · `msc4222` · `msc3266` · `msc3401_matrix_rtc` | All safe to use now                                                            |
-| **MSC flags OFF:** `msc4306` (thread subscriptions) · `msc3882` · `msc3912` · `msc4155`                                                             | These features are BLOCKED                                                     |
-| **MSC3266** room summary: flag `msc3266_enabled: true` set but `GET /v1/rooms/{id}/summary` still returns 404 (M_UNRECOGNIZED)                      | Room Preview BLOCKED — endpoint not implemented in Synapse 1.155               |
-| **MSC3892** relation redaction: not in flags                                                                                                        | Reaction Redaction feature BLOCKED                                             |
-| **MSC4260** report user: `POST /_matrix/client/v3/users/{userId}/report` returns **200** ✅                                                         | **Report User UNBLOCKED** — endpoint live since Synapse 1.133; ready to build  |
-| **MSC4151** report room: HTTP 405 on GET = endpoint exists (POST only)                                                                              | Report Room live ✅                                                            |
-| `folds AvatarImage` does NOT accept children                                                                                                        | Add frame/overlay inside `UserAvatar.tsx` itself — optional `frameName` prop   |
-| No in-app toast system exists (was)                                                                                                                 | Built `ToastProvider` + Jotai queue; at `App.tsx:65`                           |
-| `useUnverifiedDeviceCount()` hook exists                                                                                                            | `src/app/hooks/useDeviceVerificationStatus.ts:65-106`                          |
-| Voice player: `AudioContent.tsx:44-223`                                                                                                             | Playback rate on hidden `<audio>` at line 217                                  |
-| `CallControl.setMicrophone(bool)` at `CallControl.ts:206-212`                                                                                       | For AFK auto-mute                                                              |
-| `CallControl.toggleSound()` at `CallControl.ts:230-251`                                                                                             | Push-to-deafen — just wire a hotkey to this                                    |
-| matrix-js-sdk has NO arbitrary profile field methods                                                                                                | Use `mx.http.authedRequest()` for MSC4133                                      |
-| Sanitizer (`sanitize.ts`) allows table, div, span, a, code, hr                                                                                      | LFG HTML card is safe locally; test on Element/FluffyChat                      |
-| Sanitizer STRIPS `<math>`/MathML tags                                                                                                               | Math/LaTeX task must also modify sanitizer                                     |
-| Service worker EXISTS at `src/sw.ts`                                                                                                                | Quick-reply task: add `notificationclick` handler                              |
-| `knockSupported()` utility exists at `matrix.ts:376-391`                                                                                            | Knock UX: only need "Request to Join" in `RoomIntro.tsx`                       |
-| `KeywordMessages.tsx` already has custom keyword push rules                                                                                         | Full push rule editor: only non-keyword rule types need new UI                 |
-| `getMatrixToRoom()` in `matrix-to.ts` generates invite URLs                                                                                         | Invite link: just add QR code to room settings                                 |
-| Cindy CANNOT inject audio into EC call stream                                                                                                       | In-call soundboard must be redesigned as local-only                            |
-| Folds uses vanilla-extract in non-TDS, NOT CSS custom properties                                                                                    | Custom accent color: must create new vanilla-extract theme variant dynamically |
-| Theme presets need ~50 CSS custom properties each                                                                                                   | Significant design work before coding                                          |
-| `useCallSpeakers.ts` CSS MutationObserver polling                                                                                                   | Visual speaking indicator: TDS ring animation on top of existing data          |
-| MSC3489/3672 live location: BOTH false on server                                                                                                    | Live Location BLOCKED                                                          |
+| Finding                                                                                                                                                  | Impact                                                                                                  |
+| -------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |
+| **MSC flags ON:** `msc4140` · `msc3771` · `msc3440.stable` · `msc4133.stable` · `simplified_msc3575` · `msc4222` · `msc3266` · `msc3401_matrix_rtc`      | All safe to use now                                                                                     |
+| **MSC flags OFF:** `msc4306` (thread subscriptions) · `msc3882` · `msc3912` · `msc4155`                                                                  | These features are BLOCKED                                                                              |
+| **MSC3266** room summary: flag `msc3266_enabled: true` set but `GET /v1/rooms/{id}/summary` still returns 404 (M_UNRECOGNIZED)                           | Room Preview BLOCKED — endpoint not implemented in Synapse 1.155                                        |
+| **MSC3892** relation redaction: not in flags                                                                                                             | Reaction Redaction feature BLOCKED                                                                      |
+| **MSC4260** report user: `POST /_matrix/client/v3/users/{userId}/report` returns **200** ✅                                                              | **Report User UNBLOCKED** — endpoint live since Synapse 1.133; ready to build                           |
+| **MSC4151** report room: HTTP 405 on GET = endpoint exists (POST only)                                                                                   | Report Room live ✅                                                                                     |
+| `folds AvatarImage` does NOT accept children                                                                                                             | Add frame/overlay inside `UserAvatar.tsx` itself — optional `frameName` prop                            |
+| No in-app toast system exists (was)                                                                                                                      | Built `ToastProvider` + Jotai queue; at `App.tsx:65`                                                    |
+| `useUnverifiedDeviceCount()` hook exists                                                                                                                 | `src/app/hooks/useDeviceVerificationStatus.ts:65-106`                                                   |
+| Voice player: `AudioContent.tsx:44-223`                                                                                                                  | Playback rate on hidden `<audio>` at line 217                                                           |
+| `CallControl.setMicrophone(bool)` at `CallControl.ts:206-212`                                                                                            | For AFK auto-mute                                                                                       |
+| `CallControl.toggleSound()` at `CallControl.ts:230-251`                                                                                                  | Push-to-deafen — just wire a hotkey to this                                                             |
+| matrix-js-sdk has NO arbitrary profile field methods                                                                                                     | Use `mx.http.authedRequest()` for MSC4133                                                               |
+| Sanitizer (`sanitize.ts`) allows table, div, span, a, code, hr                                                                                           | LFG HTML card is safe locally; test on Element/FluffyChat                                               |
+| Sanitizer STRIPS `<math>`/MathML tags                                                                                                                    | Math/LaTeX task must also modify sanitizer                                                              |
+| Service worker EXISTS at `src/sw.ts`                                                                                                                     | Quick-reply task: add `notificationclick` handler                                                       |
+| `knockSupported()` utility exists at `matrix.ts:376-391`                                                                                                 | Knock UX: only need "Request to Join" in `RoomIntro.tsx`                                                |
+| `KeywordMessages.tsx` already has custom keyword push rules                                                                                              | Full push rule editor: only non-keyword rule types need new UI                                          |
+| `getMatrixToRoom()` in `matrix-to.ts` generates invite URLs                                                                                              | Invite link: just add QR code to room settings                                                          |
+| ~~Cindy CANNOT inject audio into EC call stream~~ **UNBLOCKED by EC fork** — `io.lotus.inject_audio` widget action publishes a clip as a real call track | In-call soundboard CAN now mix into the call (no longer local-only); needs cinny UI to drive the action |
+| Folds uses vanilla-extract in non-TDS, NOT CSS custom properties                                                                                         | Custom accent color: must create new vanilla-extract theme variant dynamically                          |
+| Theme presets need ~50 CSS custom properties each                                                                                                        | Significant design work before coding                                                                   |
+| `useCallSpeakers.ts` CSS MutationObserver polling                                                                                                        | Visual speaking indicator: TDS ring animation on top of existing data                                   |
+| MSC3489/3672 live location: BOTH false on server                                                                                                         | Live Location BLOCKED                                                                                   |
 
 ---
 
@@ -266,12 +269,17 @@ Features:
 
 ---
 
-### [ ] P5-15 · In-Call Soundboard
+### [~] P5-15 · In-Call Soundboard — IMPLEMENTED (⚠️ awaiting live verification, D2-7)
 
-**What:** Grid of short audio clips playable into the call audio stream via Web Audio API (AudioBufferSourceNode → MediaStreamDestinationNode → mixed with mic). Built-in clips + user-uploadable custom clips (stored as mxc://). Accessible from call controls bar.  
-**[AUDIT REQUIRED]** Verify the Element Call integration exposes the mic MediaStream for mixing. This is the highest-risk part of this feature.  
-**🔱 [EC-FORK]** Owning the EC source (see [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md)) would unblock real audio-injection — a proper soundboard mixed into the call — which is impossible against the prebuilt bundle today.  
-**Complexity:** High.
+**What:** Soundboard button in the call controls bar → popout grid of the user's clips; clicking one plays it **into the call** as a real published track (peers hear it) and locally (presser hears it). Clips are **user-uploadable, just like custom emojis/stickers**.  
+**🔱 [EC-FORK] Fork side + cinny side DONE.** The fork ships `io.lotus.inject_audio` (`LotusWidgetActions.InjectAudio`, allow-listed in `widget.ts`), armed via the `lotusAudioInject=1` flag; it publishes a clip as a separate LiveKit track — a **real** in-call soundboard mixed into the call, not local-only. cinny now drives it.  
+**Shipped (cinny):**
+
+- Clips stored in `io.lotus.soundboard` account data → **synced across devices like emoji/sticker packs** (`useSoundboard` hook; `AccountDataEvent.LotusSoundboard`).
+- Upload audio (≤1 MB, ≤40 clips) → `mx.uploadContent` → mxc; play resolves mxc → authed download → `blob:` object URL (the widget can't fetch authenticated media itself) → `control.injectAudio(url, volume)` + local playback.
+- `CallSoundboard.tsx` popout in the call bar (upload / play / delete), gated on the `soundboardEnabled` setting (Settings → General → Calls, + volume slider).  
+  **Remaining:** a dedicated Settings management page (optional — upload/delete already live in the popout); a small default clip set; live verification (D2-7). Files: `utils/soundboardClips.ts`, `hooks/useSoundboard.ts`, `features/call/CallSoundboard.tsx`, `plugins/call/CallControl.ts#injectAudio`.  
+  **Complexity:** Medium — done.
 
 ---
 
@@ -287,26 +295,38 @@ Features:
 ### [x] P5-30 · Advanced ML Noise Suppression (Krisp-style)
 
 **What:** High-end background noise cancellation using a pre-trained ML model (RNNoise) running in the browser. Removes dogs, fans, and keyboard clicks from the mic stream.  
-**Shipped:** 3-tier setting (Off / Browser-native / ML) in Settings → General → Calls. ML tier injects a same-origin pre-init shim into the vendored Element Call `index.html` that monkeypatches `getUserMedia` and routes the captured mic through an RNNoise `AudioWorklet` before LiveKit publishes — no EC fork required. See LOTUS_FEATURES.md → "Noise Suppression (Advanced Multi-Tier)".  
-**🔱 [EC-FORK]** Once we own the EC source (see [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md)), denoise should become a first-class audio stage **inside** EC instead of an `index.html` getUserMedia monkeypatch — more robust, survives reconnects (fixes the A7 mic-after-reconnect bug), and removes the build-time injection hack.  
-**Key decision:** LiveKit's Krisp filter is LiveKit-Cloud-only (we self-host the SFU); EC's own RNNoise PR #3892 is unmerged. The shim is the same post-capture pipeline #3892 uses, executed from the realm we control, so it survives EC version bumps.  
-**AEC note (resolved-as-accepted):** WebAudio capture routing can weaken browser AEC — same tradeoff as EC's upstream feature; mitigated by keeping `echoCancellation`/`autoGainControl` on the raw capture and labeling the tier "beta".
+**Shipped:** 3-tier setting (Off / Browser-native / ML) in Settings → General → Calls.  
+**🔱 [EC-FORK] DONE — moved in-source (2026-06).** ML denoise is now a first-class audio stage **inside** the forked Element Call: a LiveKit `TrackProcessor<Audio>` activated by `lotusDenoiseSource=1` (cinny sets it when ML is selected). The old build-time `getUserMedia`/`index.html` monkeypatch is **removed**. Because EC re-runs the processor on every (re)publish, denoise now **survives reconnects and mic-device switches** — this is the A7 fix (see `LOTUS_BUGS.md` A7, `LOTUS_TESTING.md` §D2-1). The processor degrades to the raw mic rather than going silent.  
+**Key decision:** LiveKit's Krisp filter is LiveKit-Cloud-only (we self-host the SFU); EC's own RNNoise PR #3892 is unmerged. Owning the fork let us implement the in-source stage directly.
 
-**Model Roadmap (priority order):**
+**Models — all in-source in the fork:**
 
-- [ ] **Verify DTLN** (16 kHz narrowband fix) in a real call before investing further — wired but unverified.
-- [ ] **DeepFilterNet 3** — best self-hostable upgrade: Rust→WASM, CPU real-time, 48 kHz fullband. Effort: self-host `df_bg.wasm` + DFN3 ONNX model, wire a 48 kHz worklet.
-- [ ] **Desktop-only / HW-gated:** FRCRN or NVIDIA Maxine (RTX/Tensor only) — impossible in-browser; would run in Tauri Rust backend + bridge a virtual mic into the webview. Must detect capability and only offer on supported hardware; web falls back to RNNoise.
+- [x] **RNNoise** (48 kHz, default) · **Speex** (48 kHz) · **DTLN** (16 kHz) · **DeepFilterNet 3** (48 kHz) — all four wired and selectable.
+- [ ] **Open verification:** real-call **audio-quality** comparison across the four models (RNNoise output is known-weak). Track under the denoise quality project, `LOTUS_TESTING.md` §D2-1 / J2.
+- [ ] **Desktop-only / HW-gated (future):** FRCRN or NVIDIA Maxine (RTX/Tensor only) — impossible in-browser; would run in the Tauri Rust backend + bridge a virtual mic into the webview. Detect capability; web falls back to RNNoise.
 - **Excluded:** Krisp (LiveKit Cloud only); FRCRN/Maxine on web (GPU/server-bound).
 
 ---
 
-### [ ] P5-31 · Granular Voice & Screenshare Quality Controls (Discord-style)
+### [~] P5-31 · Granular Voice & Screenshare Quality Controls — IMPLEMENTED (⚠️ awaiting live verification, D2-8)
 
-**What:** Let users (or room admins via room settings) adjust audio bitrates (e.g., 64kbps to 512kbps) and screenshare quality (resolution: 720p/1080p/Source, framerate: 15/30/60fps).  
-**Note:** Requires tight integration with the LiveKit SFU and custom state events for per-room quality caps.  
-**[AUDIT REQUIRED]** Must verify if current `lk-jwt-service` can be extended with custom bitrate/resolution claims or if a new sidecar (similar to `voice-limit-guard`) is needed for server-side enforcement.  
-**Complexity:** Extreme.
+**What:** Let users (and room admins) adjust audio bitrate and screenshare bitrate/framerate.  
+**🔱 [EC-FORK] Fork side + client side DONE.** The fork ships `io.lotus.set_quality` (`LotusWidgetActions.SetQuality`) that applies audio/screenshare encoding params (`RTCRtpSender.setParameters`, all simulcast encodings, re-applied on `TrackUnmuted`/republish) inside EC. cinny now drives it.
+
+**Shipped (cinny):**
+
+1. **User settings** (Settings → General → Calls): Microphone Bitrate, Screenshare Bitrate, Screenshare Framerate (`callAudioBitrate` / `screenshareBitrate` / `screenshareFramerate`).
+2. **Room-admin caps**: `io.lotus.room_quality` state event (`StateEvent.LotusRoomQuality`) + `RoomQuality.tsx` in Room Settings → General → Voice (mirrors `RoomVoiceLimit`).
+3. **Apply logic**: `useCallQuality` (wired in `CallEmbedProvider`'s `CallUtils`) builds `min(user setting, room cap)` and sends `io.lotus.set_quality` on join / when settings change (`utils/callQuality.ts`, unit-tested).
+
+**Server-side enforcement (DONE — matrix repo):** extended `voice-limit-guard.py` (LXC 151) to also read `io.lotus.room_quality` and hard-enforce a **publish-source policy** for ALL clients.
+
+- **Reality (researched, primary-source, LiveKit 1.9.11):** numeric bitrate/fps caps **cannot** be hard-enforced server-side — LiveKit is a pure SFU (forwards, never transcodes); there is NO bitrate/fps field in the JWT grant, `RoomConfiguration`, server `limit:` config, or any admin RPC, and stock Element Call ignores room metadata / custom claims for publish quality. So numeric caps stay **cooperative** (our fork honors them via `min()` → `set_quality`, already shipped).
+- **What IS hard-enforced cross-client:** `VideoGrant.canPublishSources`. The guard holds the LiveKit secret, so when `io.lotus.room_quality` sets `allow_screenshare:false` / `allow_camera:false` it re-signs the issued JWT with a narrowed source list → the SFU refuses those tracks for **every** client (Element, FluffyChat, our fork). Mic always kept. Fail-open; unit-tested (`livekit/test_voice_limit_guard.py`). Admin UI: Room Settings → Voice → **Call Permissions** switches. cinny also hides the blocked buttons.
+- **Live (mid-call) enforcement — DONE:** the JWT re-sign covers new joins; for participants **already in the call**, a background reconcile loop in the guard calls LiveKit `UpdateParticipant` every ~3 s to narrow `canPublishSources`, which unpublishes an in-progress screenshare/camera **server-side for all clients** and blocks re-publish (verified LiveKit 1.9.11 auto-unpublishes on permission narrowing). Only removes forbidden sources (never grants), preserves other permission flags, no-ops once compliant. So flipping a room audio-only kills live cameras/screenshares within ~one interval.
+- **Not enforceable / deferred:** numeric server enforcement (impossible — see above); screenshare **resolution** control (`set_quality` covers bitrate + framerate; resolution needs a `getDisplayMedia` hook inside the fork).
+
+**Complexity:** DONE — client (cooperative numeric caps) + server (hard publish-source policy). Only the physically-impossible numeric server enforcement is out of scope.
 
 ---
 
@@ -540,7 +560,7 @@ Exhaustive, low-level implementation details for backlog items. Follow these pat
 
 > ⚠️ **[Gemini_Found — CORRECTED]** Gemini originally suggested using LiveKit's `LocalAudioTrack.replaceTrack()` to mix audio into the call stream. This is **not possible** from Lotus Chat's realm: Element Call runs in a **cross-origin iframe** controlled via `matrix-widget-api` (postMessage). LiveKit's JS SDK and its `LocalAudioTrack` live inside EC's sandboxed context — inaccessible from our code. This directly contradicts the confirmed constraint already listed in the Server Capabilities table: _"Cindy CANNOT inject audio into EC call stream — In-call soundboard must be redesigned as local-only."_ The soundboard must be a local-playback-only feature (output through the user's speakers, not mixed into the call audio stream).
 >
-> 🔱 **[EC-FORK — partial correction]** The "cross-origin" claim above is **outdated**: EC is now **same-origin** / self-hosted (`iframe.sandbox` has `allow-same-origin`; we read `contentDocument`). The _practical_ blocker still holds — LiveKit's `LocalAudioTrack` lives in EC's **module scope** (not on `window`), so it's unreachable from cinny even same-origin. **Owning the EC source** (see [`HANDOFF_ELEMENT_CALL_FORK.md`](./HANDOFF_ELEMENT_CALL_FORK.md)) is the path to a real call-audio-inject API, which would unblock a true in-call soundboard.
+> 🔱 **[EC-FORK — RESOLVED]** Both the original claim and the earlier "practical blocker still holds" correction are now **outdated**. EC is same-origin **and** we own the source, so we no longer reach into EC's module scope from cinny — instead the fork **exposes the inject point itself**: the `io.lotus.inject_audio` widget action (`LotusWidgetActions.InjectAudio`) publishes a clip as a separate LiveKit track from inside EC. A **real** in-call soundboard (mixed into the call, not local-only) is therefore unblocked; only the cinny-side UI remains (see P5-15 above). The capability ships dormant today.
 
 ---
 
diff --git a/README.md b/README.md
index 1218adc22..d4faea1ff 100644
--- a/README.md
+++ b/README.md
@@ -144,22 +144,25 @@ The source code lives in `/root/code/cinny`. All changes should be made on the `
 
 See [LOTUS_FEATURES.md](LOTUS_FEATURES.md) for the full feature changelog and [LOTUS_TODO.md](LOTUS_TODO.md) for the work backlog.
 
-### 🔱 Planned: Element Call fork ("Lotus Call")
+### 🔱 Element Call fork ("Lotus Call") — LIVE
 
-Voice/video channels embed **Element Call**. Today it's a **pre-built npm bundle**
-(`@element-hq/element-call-embedded` 0.20.1) copied to `public/element-call/` and
-served same-origin; we steer it via the `matrix-widget-api` plus fragile DOM
-hacks. Because we don't own its compiled source, several in-call issues (avatar
-decorations on tiles, camera focus/fullscreen during screenshare, mic recovery
-after reconnect, native theming, real call-audio injection) are unfixable from
-outside.
+Voice/video channels embed **Element Call**, which is now our **self-built fork**
+(`@lotusguild/element-call-embedded` `0.20.1-lotus.1`, source at
+`LotusGuild/element-call`), published to our private Gitea npm registry and served
+same-origin. We no longer depend on the upstream prebuilt bundle, so in-call
+behavior is editable source instead of fragile DOM/widget hacks.
 
-**The plan is to fork `element-hq/element-call` into a new `LotusGuild/element-call`
-repo, build it from source, and host our own build** for true ownership. The full
-self-contained plan and integration map — written for a fresh session with no
-prior context — is in **[`HANDOFF_ELEMENT_CALL_FORK.md`](HANDOFF_ELEMENT_CALL_FORK.md)**.
-Infra/hosting notes also live in the `LotusGuild/matrix` repo README. Search the
-docs for the **`[EC-FORK]`** tag to find every related note.
+**Shipped via the fork:** denoise as an in-source LiveKit audio stage (survives
+reconnects), in-call speaking/mute events, focus-a-participant during screenshare,
+avatar decorations on EC video tiles, and a native transparent background.
+**Built but dormant (need cinny UI):** real call-audio injection
+(`io.lotus.inject_audio` → in-call soundboard) and quality controls
+(`io.lotus.set_quality`).
+
+The full plan and integration map is in
+**[`HANDOFF_ELEMENT_CALL_FORK.md`](HANDOFF_ELEMENT_CALL_FORK.md)**; infra/hosting +
+build-pipeline notes live in the `LotusGuild/matrix` repo README. Search the docs
+for the **`[EC-FORK]`** tag to find every related note.
 
 ### Build
 
diff --git a/src/app/components/CallEmbedProvider.tsx b/src/app/components/CallEmbedProvider.tsx
index 9d8ab8a88..f9ce307ac 100644
--- a/src/app/components/CallEmbedProvider.tsx
+++ b/src/app/components/CallEmbedProvider.tsx
@@ -45,6 +45,7 @@ import { useMatrixClient } from '../hooks/useMatrixClient';
 import { previewRingtone, startRingtone } from '../utils/ringtones';
 import { useCallMembersChange, useCallSession } from '../hooks/useCall';
 import { useCallJoinLeaveSounds } from '../hooks/useCallJoinLeaveSounds';
+import { useCallQuality } from '../hooks/useCallQuality';
 import { useRemoteAllMuted } from '../hooks/useCallSpeakers';
 import { useRoomAvatar, useRoomName } from '../hooks/useRoomMeta';
 import { mDirectAtom } from '../state/mDirectList';
@@ -584,6 +585,7 @@ function CallUtils({ embed }: { embed: CallEmbed }) {
   useCallMemberSoundSync(embed);
   useCallJoinLeaveSounds(embed);
   useCallThemeSync(embed);
+  useCallQuality(embed);
   useCallHangupEvent(
     embed,
     useCallback(() => {
diff --git a/src/app/features/call/CallControls.tsx b/src/app/features/call/CallControls.tsx
index 10286ed13..a27ab30ef 100644
--- a/src/app/features/call/CallControls.tsx
+++ b/src/app/features/call/CallControls.tsx
@@ -37,6 +37,10 @@ import { stopPropagation } from '../../utils/keyboard';
 import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
 import { useCallEmbedRef } from '../../hooks/useCallEmbed';
 import { useAfkAutoMute } from '../../hooks/useAfkAutoMute';
+import { CallSoundboard } from './CallSoundboard';
+import { useStateEvent } from '../../hooks/useStateEvent';
+import { StateEvent } from '../../../types/matrix/room';
+import { RoomQualityContent } from '../../utils/callQuality';
 
 type CallControlsProps = {
   callEmbed: CallEmbed;
@@ -88,6 +92,19 @@ export function CallControls({ callEmbed }: CallControlsProps) {
   const [pttMode] = useSetting(settingsAtom, 'pttMode');
   const [pttKey] = useSetting(settingsAtom, 'pttKey');
   const [deafenKey] = useSetting(settingsAtom, 'deafenKey');
+  const [soundboardEnabled] = useSetting(settingsAtom, 'soundboardEnabled');
+
+  // [P5-31] Hard room publish policy — hide controls the server will refuse so
+  // users don't click dead buttons. Absent/true = allowed.
+  const roomQualityEvent = useStateEvent(callEmbed.room, StateEvent.LotusRoomQuality);
+  const roomQuality = roomQualityEvent?.getContent<RoomQualityContent>();
+  const cameraAllowed = roomQuality?.allow_camera !== false;
+  const screenshareAllowed = roomQuality?.allow_screenshare !== false;
+  // Keep a forbidden control visible while its track is still live (so the user
+  // can stop it); otherwise hide it entirely.
+  const showCamera = cameraAllowed || video;
+  const showScreenshare = screenshareAllowed || screenshare;
+  const showVideoGroup = showCamera || showScreenshare || !!document.fullscreenEnabled;
   const [pttActive, setPttActive] = useState(false);
 
   // Track microphone via ref so the PTT effect doesn't need it as a dep (avoids listener churn)
@@ -339,24 +356,31 @@ export function CallControls({ callEmbed }: CallControlsProps) {
               onToggle={() => callEmbed.control.toggleScreenshareAudio()}
             />
           </Box>
-          {!compact && <ControlDivider />}
-          <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
-            <VideoButton enabled={video} onToggle={handleVideoToggle} />
-            <ScreenShareButton
-              enabled={screenshare}
-              onToggle={() =>
-                screenshare ? callEmbed.control.toggleScreenshare() : setShareConfirm(true)
-              }
-            />
-            {!!document.fullscreenEnabled && (
-              <FullscreenButton isFullscreen={isFullscreen} onToggle={handleFullscreen} />
-            )}
-          </Box>
+          {!compact && showVideoGroup && <ControlDivider />}
+          {showVideoGroup && (
+            <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
+              {/* Show a forbidden control while its track is still live so the
+                  user can stop it; once stopped it hides and can't be restarted. */}
+              {showCamera && <VideoButton enabled={video} onToggle={handleVideoToggle} />}
+              {showScreenshare && (
+                <ScreenShareButton
+                  enabled={screenshare}
+                  onToggle={() =>
+                    screenshare ? callEmbed.control.toggleScreenshare() : setShareConfirm(true)
+                  }
+                />
+              )}
+              {!!document.fullscreenEnabled && (
+                <FullscreenButton isFullscreen={isFullscreen} onToggle={handleFullscreen} />
+              )}
+            </Box>
+          )}
         </Box>
         {!compact && <ControlDivider />}
         <Box alignItems="Center" gap="Inherit" grow="Yes" direction={compact ? 'Column' : 'Row'}>
           <Box shrink="No" alignItems="Inherit" justifyContent="Inherit" gap="200">
             <ChatButton />
+            {soundboardEnabled && <CallSoundboard callEmbed={callEmbed} />}
             <PopOut
               anchor={cords}
               position="Top"
diff --git a/src/app/features/call/CallSoundboard.tsx b/src/app/features/call/CallSoundboard.tsx
new file mode 100644
index 000000000..05f711435
--- /dev/null
+++ b/src/app/features/call/CallSoundboard.tsx
@@ -0,0 +1,220 @@
+import React, { MouseEventHandler, useCallback, useRef, useState } from 'react';
+import {
+  Box,
+  Chip,
+  Icon,
+  IconButton,
+  Icons,
+  Menu,
+  PopOut,
+  RectCords,
+  Spinner,
+  Text,
+  Tooltip,
+  TooltipProvider,
+  color,
+  config,
+} from 'folds';
+import FocusTrap from 'focus-trap-react';
+import { CallEmbed } from '../../plugins/call';
+import { useMatrixClient } from '../../hooks/useMatrixClient';
+import { useSoundboard } from '../../hooks/useSoundboard';
+import { useSetting } from '../../state/hooks/settings';
+import { settingsAtom } from '../../state/settings';
+import { stopPropagation } from '../../utils/keyboard';
+import {
+  SOUNDBOARD_ACCEPT,
+  SOUNDBOARD_MAX_CLIPS,
+  playClipLocally,
+  resolveClipObjectUrl,
+} from '../../utils/soundboardClips';
+
+type CallSoundboardProps = {
+  callEmbed: CallEmbed;
+};
+
+/**
+ * [P5-15] In-call soundboard: trigger user-uploaded clips into the call. Each
+ * clip is published to peers as a separate track by the EC fork
+ * (`io.lotus.inject_audio`) and also played locally for the presser's feedback.
+ * Clips are uploadable/managed here and synced across devices via the
+ * `io.lotus.soundboard` account data (like custom emoji/sticker packs).
+ */
+export function CallSoundboard({ callEmbed }: CallSoundboardProps) {
+  const mx = useMatrixClient();
+  const { clips, addClip, removeClip } = useSoundboard();
+  const [soundboardVolume] = useSetting(settingsAtom, 'soundboardVolume');
+
+  const [cords, setCords] = useState<RectCords>();
+  const [busyId, setBusyId] = useState<string>();
+  const [uploading, setUploading] = useState(false);
+  const [error, setError] = useState<string>();
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
+  const volume = Math.max(0, Math.min(1, soundboardVolume / 100));
+
+  const handleOpen: MouseEventHandler<HTMLButtonElement> = (evt) => {
+    setError(undefined);
+    setCords(evt.currentTarget.getBoundingClientRect());
+  };
+
+  const handlePlay = useCallback(
+    async (id: string, mxc: string) => {
+      setBusyId(id);
+      setError(undefined);
+      try {
+        const objectUrl = await resolveClipObjectUrl(mx, mxc);
+        callEmbed.control.injectAudio(objectUrl, volume);
+        playClipLocally(objectUrl, volume);
+      } catch {
+        setError('Could not play that clip.');
+      } finally {
+        setBusyId(undefined);
+      }
+    },
+    [mx, callEmbed, volume],
+  );
+
+  const handleFile = useCallback(
+    async (file: File | undefined) => {
+      if (!file) return;
+      setUploading(true);
+      setError(undefined);
+      try {
+        await addClip(file);
+      } catch (e) {
+        setError(e instanceof Error ? e.message : 'Upload failed.');
+      } finally {
+        setUploading(false);
+      }
+    },
+    [addClip],
+  );
+
+  return (
+    <>
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept={SOUNDBOARD_ACCEPT}
+        hidden
+        onChange={(e) => {
+          handleFile(e.target.files?.[0]);
+          e.target.value = '';
+        }}
+      />
+      <PopOut
+        anchor={cords}
+        position="Top"
+        align="Center"
+        content={
+          <FocusTrap
+            focusTrapOptions={{
+              initialFocus: false,
+              onDeactivate: () => setCords(undefined),
+              clickOutsideDeactivates: true,
+              escapeDeactivates: stopPropagation,
+            }}
+          >
+            <Menu style={{ maxWidth: '320px' }}>
+              <Box direction="Column" gap="200" style={{ padding: config.space.S200 }}>
+                <Box alignItems="Center" justifyContent="SpaceBetween" gap="200">
+                  <Text size="L400">Soundboard</Text>
+                  <Chip
+                    variant="Secondary"
+                    radii="Pill"
+                    disabled={uploading || clips.length >= SOUNDBOARD_MAX_CLIPS}
+                    onClick={() => fileInputRef.current?.click()}
+                    before={
+                      uploading ? <Spinner size="100" /> : <Icon size="100" src={Icons.Plus} />
+                    }
+                  >
+                    <Text size="B300">Upload</Text>
+                  </Chip>
+                </Box>
+
+                {clips.length === 0 ? (
+                  <Text size="T200" priority="300">
+                    No clips yet. Upload a short audio clip (max 1 MB) to play it into the call.
+                    Clips sync across your devices.
+                  </Text>
+                ) : (
+                  <Box wrap="Wrap" gap="200">
+                    {clips.map((clip) => (
+                      <Box
+                        key={clip.id}
+                        direction="Column"
+                        gap="100"
+                        style={{ position: 'relative' }}
+                      >
+                        <Chip
+                          variant="SurfaceVariant"
+                          radii="300"
+                          disabled={busyId === clip.id}
+                          onClick={() => handlePlay(clip.id, clip.url)}
+                          before={
+                            busyId === clip.id ? (
+                              <Spinner size="100" />
+                            ) : (
+                              <Icon size="100" src={Icons.Play} />
+                            )
+                          }
+                          after={
+                            <Icon
+                              size="50"
+                              src={Icons.Cross}
+                              style={{ cursor: 'pointer' }}
+                              onClick={(e: React.MouseEvent) => {
+                                e.stopPropagation();
+                                removeClip(clip.id);
+                              }}
+                            />
+                          }
+                        >
+                          <Text size="B300" truncate style={{ maxWidth: '120px' }}>
+                            {clip.name}
+                          </Text>
+                        </Chip>
+                      </Box>
+                    ))}
+                  </Box>
+                )}
+
+                {error && (
+                  <Text size="T200" style={{ color: color.Critical.Main }}>
+                    {error}
+                  </Text>
+                )}
+              </Box>
+            </Menu>
+          </FocusTrap>
+        }
+      >
+        <TooltipProvider
+          tooltip={
+            <Tooltip>
+              <Text>Soundboard</Text>
+            </Tooltip>
+          }
+        >
+          {(triggerRef) => (
+            <IconButton
+              ref={triggerRef}
+              variant="Surface"
+              fill="Soft"
+              radii="400"
+              size="400"
+              onClick={handleOpen}
+              outlined
+              aria-label="Soundboard"
+              aria-expanded={!!cords}
+              aria-haspopup="menu"
+            >
+              <Icon size="400" src={Icons.BellRing} />
+            </IconButton>
+          )}
+        </TooltipProvider>
+      </PopOut>
+    </>
+  );
+}
diff --git a/src/app/features/common-settings/general/RoomQuality.tsx b/src/app/features/common-settings/general/RoomQuality.tsx
new file mode 100644
index 000000000..aa8322f75
--- /dev/null
+++ b/src/app/features/common-settings/general/RoomQuality.tsx
@@ -0,0 +1,198 @@
+import React, { useCallback, useEffect, useMemo, useState } from 'react';
+import { Box, Switch, Text } from 'folds';
+import { SequenceCard } from '../../../components/sequence-card';
+import { SequenceCardStyle } from '../../room-settings/styles.css';
+import { SettingTile } from '../../../components/setting-tile';
+import { SettingsSelect } from '../../../components/settings-select/SettingsSelect';
+import { useMatrixClient } from '../../../hooks/useMatrixClient';
+import { useRoom } from '../../../hooks/useRoom';
+import { StateEvent } from '../../../../types/matrix/room';
+import { useStateEvent } from '../../../hooks/useStateEvent';
+import { RoomPermissionsAPI } from '../../../hooks/useRoomPermissions';
+import { AsyncStatus, useAsyncCallback } from '../../../hooks/useAsyncCallback';
+import {
+  AUDIO_BITRATE_OPTIONS,
+  RoomQualityContent,
+  SCREENSHARE_BITRATE_OPTIONS,
+  SCREENSHARE_FRAMERATE_OPTIONS,
+} from '../../../utils/callQuality';
+
+// Only the numeric cap keys are edited via `update`; the boolean policy keys
+// are handled by `setAllow`.
+type CapKey = 'audio_max_kbps' | 'screenshare_max_kbps' | 'screenshare_max_fps';
+
+// String <-> numeric bridge for SettingsSelect (which needs string values).
+const toValue = (n?: number): string => (typeof n === 'number' ? String(n) : 'auto');
+
+const CAP_KEYS: (keyof RoomQualityContent)[] = [
+  'audio_max_kbps',
+  'screenshare_max_kbps',
+  'screenshare_max_fps',
+  'allow_screenshare',
+  'allow_camera',
+];
+const capsEqual = (a: RoomQualityContent, b: RoomQualityContent): boolean =>
+  CAP_KEYS.every((k) => a[k] === b[k]);
+
+type RoomQualityProps = {
+  permissions: RoomPermissionsAPI;
+};
+/**
+ * [P5-31] Room-admin quality ceiling. Writes `io.lotus.room_quality`; every
+ * Lotus client clamps its per-user quality to these caps. Hard enforcement for
+ * ALL Matrix clients is a server-side follow-up (see LOTUS_TODO.md P5-31).
+ */
+export function RoomQuality({ permissions }: RoomQualityProps) {
+  const mx = useMatrixClient();
+  const room = useRoom();
+
+  const canEdit = permissions.stateEvent(StateEvent.LotusRoomQuality, mx.getSafeUserId());
+
+  const event = useStateEvent(room, StateEvent.LotusRoomQuality);
+  const caps = useMemo<RoomQualityContent>(() => event?.getContent() ?? {}, [event]);
+
+  const [submitState, submit] = useAsyncCallback(
+    useCallback(
+      async (next: RoomQualityContent) => {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        await mx.sendStateEvent(room.roomId, StateEvent.LotusRoomQuality as any, next);
+      },
+      [mx, room.roomId],
+    ),
+  );
+  const submitting = submitState.status === AsyncStatus.Loading;
+
+  // Optimistic mirror: `useStateEvent` only refreshes when the write echoes
+  // back via /sync (not when sendStateEvent resolves), so consecutive edits
+  // must build on the pending write — otherwise a second edit spreads a stale
+  // `caps` and silently drops the first. `effective` is what the UI shows and
+  // what each edit merges into; it's reconciled below once the echo lands.
+  const [pending, setPending] = useState<RoomQualityContent | null>(null);
+  const effective = pending ?? caps;
+
+  useEffect(() => {
+    if (!pending) return;
+    // Revert the optimistic view if the write failed…
+    if (submitState.status === AsyncStatus.Error) {
+      setPending(null);
+      return;
+    }
+    // …or drop it once the synced state actually reflects it.
+    if (capsEqual(caps, pending)) setPending(null);
+  }, [caps, pending, submitState.status]);
+
+  const commit = (next: RoomQualityContent) => {
+    setPending(next);
+    submit(next);
+  };
+
+  const update = (key: CapKey, value: string) => {
+    const next: RoomQualityContent = { ...effective };
+    if (value === 'auto') delete next[key];
+    else next[key] = parseInt(value, 10);
+    commit(next);
+  };
+
+  const setAllow = (key: 'allow_screenshare' | 'allow_camera', allowed: boolean) => {
+    const next: RoomQualityContent = { ...effective };
+    // Absent = allowed, so only persist the key when forbidding.
+    if (allowed) delete next[key];
+    else next[key] = false;
+    commit(next);
+  };
+
+  // Absent/true = allowed.
+  const screenshareAllowed = effective.allow_screenshare !== false;
+  const cameraAllowed = effective.allow_camera !== false;
+
+  return (
+    <SequenceCard
+      className={SequenceCardStyle}
+      variant="SurfaceVariant"
+      direction="Column"
+      gap="400"
+    >
+      <SettingTile
+        title="Call Permissions"
+        description={
+          <Text size="T200" priority="300">
+            Control what participants may share in this room. These are enforced on the server for
+            every Matrix client (Element, FluffyChat, Lotus Chat, …).
+          </Text>
+        }
+      />
+      <Box direction="Column" gap="300">
+        <SettingTile
+          title="Allow Screen Sharing"
+          description="When off, no one can share their screen in this room."
+          after={
+            <Switch
+              variant="Primary"
+              value={screenshareAllowed}
+              onChange={(v) => setAllow('allow_screenshare', v)}
+              disabled={!canEdit || submitting}
+            />
+          }
+        />
+        <SettingTile
+          title="Allow Camera"
+          description="When off, this is an audio-only room — no one can turn on their camera. Microphones are always allowed."
+          after={
+            <Switch
+              variant="Primary"
+              value={cameraAllowed}
+              onChange={(v) => setAllow('allow_camera', v)}
+              disabled={!canEdit || submitting}
+            />
+          }
+        />
+      </Box>
+
+      <SettingTile
+        title="Call Quality Caps"
+        description={
+          <Text size="T200" priority="300">
+            Set a maximum microphone bitrate, screenshare bitrate, and screenshare framerate for
+            this room. Lotus Chat clamps each participant to these ceilings (best-effort — applies
+            to Lotus Chat clients). Auto = no cap.
+          </Text>
+        }
+      />
+      <Box direction="Column" gap="300">
+        <SettingTile
+          title="Max Microphone Bitrate"
+          after={
+            <SettingsSelect
+              value={toValue(effective.audio_max_kbps)}
+              onChange={(v) => update('audio_max_kbps', v)}
+              options={AUDIO_BITRATE_OPTIONS}
+              disabled={!canEdit || submitting}
+            />
+          }
+        />
+        <SettingTile
+          title="Max Screenshare Bitrate"
+          after={
+            <SettingsSelect
+              value={toValue(effective.screenshare_max_kbps)}
+              onChange={(v) => update('screenshare_max_kbps', v)}
+              options={SCREENSHARE_BITRATE_OPTIONS}
+              disabled={!canEdit || submitting}
+            />
+          }
+        />
+        <SettingTile
+          title="Max Screenshare Framerate"
+          after={
+            <SettingsSelect
+              value={toValue(effective.screenshare_max_fps)}
+              onChange={(v) => update('screenshare_max_fps', v)}
+              options={SCREENSHARE_FRAMERATE_OPTIONS}
+              disabled={!canEdit || submitting}
+            />
+          }
+        />
+      </Box>
+    </SequenceCard>
+  );
+}
diff --git a/src/app/features/common-settings/general/index.ts b/src/app/features/common-settings/general/index.ts
index 6b8bb0a99..883ad3881 100644
--- a/src/app/features/common-settings/general/index.ts
+++ b/src/app/features/common-settings/general/index.ts
@@ -4,6 +4,7 @@ export * from './RoomHistoryVisibility';
 export * from './RoomJoinRules';
 export * from './RoomProfile';
 export * from './RoomPublish';
+export * from './RoomQuality';
 export * from './RoomShareInvite';
 export * from './RoomUpgrade';
 export * from './RoomVoiceLimit';
diff --git a/src/app/features/room-settings/general/General.tsx b/src/app/features/room-settings/general/General.tsx
index c6d29d07f..8b8c7cd57 100644
--- a/src/app/features/room-settings/general/General.tsx
+++ b/src/app/features/room-settings/general/General.tsx
@@ -11,6 +11,7 @@ import {
   RoomLocalAddresses,
   RoomPublishedAddresses,
   RoomPublish,
+  RoomQuality,
   RoomShareInvite,
   RoomUpgrade,
   RoomVoiceLimit,
@@ -58,6 +59,7 @@ export function General({ requestClose }: GeneralProps) {
               <Box direction="Column" gap="100">
                 <Text size="L400">Voice</Text>
                 <RoomVoiceLimit permissions={permissions} />
+                <RoomQuality permissions={permissions} />
               </Box>
               <Box direction="Column" gap="100">
                 <Text size="L400">Addresses</Text>
diff --git a/src/app/features/settings/general/General.tsx b/src/app/features/settings/general/General.tsx
index 7720d7932..c8916817f 100644
--- a/src/app/features/settings/general/General.tsx
+++ b/src/app/features/settings/general/General.tsx
@@ -45,6 +45,7 @@ import {
 } from '../../../utils/lotusDenoiseUtils';
 import { useSetting } from '../../../state/hooks/settings';
 import {
+  CallAudioBitrate,
   ChatBackground,
   ComposerToolbarSettings,
   DateFormat,
@@ -53,9 +54,16 @@ import {
   MessageSpacing,
   NoiseSuppressionMode,
   RingtoneId,
+  ScreenshareBitrate,
+  ScreenshareFramerate,
   Settings,
   settingsAtom,
 } from '../../../state/settings';
+import {
+  AUDIO_BITRATE_OPTIONS,
+  SCREENSHARE_BITRATE_OPTIONS,
+  SCREENSHARE_FRAMERATE_OPTIONS,
+} from '../../../utils/callQuality';
 import { SeasonalPreview, SeasonTheme } from '../../../components/seasonal/SeasonalEffect';
 import { SEASON_DATE_RANGES } from '../../../components/seasonal/seasonSchedule';
 import { SettingTile } from '../../../components/setting-tile';
@@ -1221,6 +1229,18 @@ function Calls() {
   const [ringtoneVolume, setRingtoneVolume] = useSetting(settingsAtom, 'ringtoneVolume');
   const [ringtoneId, setRingtoneId] = useSetting(settingsAtom, 'ringtoneId');
 
+  const [callAudioBitrate, setCallAudioBitrate] = useSetting(settingsAtom, 'callAudioBitrate');
+  const [screenshareBitrate, setScreenshareBitrate] = useSetting(
+    settingsAtom,
+    'screenshareBitrate',
+  );
+  const [screenshareFramerate, setScreenshareFramerate] = useSetting(
+    settingsAtom,
+    'screenshareFramerate',
+  );
+  const [soundboardEnabled, setSoundboardEnabled] = useSetting(settingsAtom, 'soundboardEnabled');
+  const [soundboardVolume, setSoundboardVolume] = useSetting(settingsAtom, 'soundboardVolume');
+
   const handleJoinLeaveSoundChange = (value: 'off' | 'chime' | 'soft' | 'retro') => {
     setCallJoinLeaveSound(value);
     if (value !== 'off') playCallJoinSound(value);
@@ -1616,6 +1636,80 @@ function Calls() {
           }
         />
       </SequenceCard>
+
+      <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+        <SettingTile
+          title="Microphone Bitrate"
+          description="Cap the audio bitrate your mic sends in calls. Lower saves bandwidth; higher is clearer. Auto lets Element Call decide."
+          after={
+            <SettingsSelect<CallAudioBitrate>
+              value={callAudioBitrate}
+              onChange={setCallAudioBitrate}
+              options={AUDIO_BITRATE_OPTIONS}
+            />
+          }
+        />
+      </SequenceCard>
+
+      <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+        <SettingTile
+          title="Screenshare Bitrate"
+          description="Cap the bitrate used when you share your screen. Lower is smoother on poor connections; higher is sharper."
+          after={
+            <SettingsSelect<ScreenshareBitrate>
+              value={screenshareBitrate}
+              onChange={setScreenshareBitrate}
+              options={SCREENSHARE_BITRATE_OPTIONS}
+            />
+          }
+        />
+      </SequenceCard>
+
+      <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+        <SettingTile
+          title="Screenshare Framerate"
+          description="Cap the frames-per-second of your screenshare. 60 fps suits motion/gaming; 15 fps suits slides and saves bandwidth."
+          after={
+            <SettingsSelect<ScreenshareFramerate>
+              value={screenshareFramerate}
+              onChange={setScreenshareFramerate}
+              options={SCREENSHARE_FRAMERATE_OPTIONS}
+            />
+          }
+        />
+      </SequenceCard>
+
+      <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+        <SettingTile
+          title="Soundboard"
+          description="Show a soundboard button in the call bar. Upload short audio clips (like custom emojis) to play them into the call. Clips sync across your devices."
+          after={
+            <Switch variant="Primary" value={soundboardEnabled} onChange={setSoundboardEnabled} />
+          }
+        />
+        {soundboardEnabled && (
+          <SettingTile
+            title="Soundboard Volume"
+            after={
+              <Box alignItems="Center" gap="200" style={{ minWidth: toRem(180) }}>
+                <input
+                  type="range"
+                  min={0}
+                  max={100}
+                  step={5}
+                  value={soundboardVolume}
+                  onChange={(e) => setSoundboardVolume(parseInt(e.target.value, 10))}
+                  style={{ flexGrow: 1 }}
+                  aria-label="Soundboard volume"
+                />
+                <Text size="T200" style={{ minWidth: toRem(36), textAlign: 'right' }}>
+                  {soundboardVolume}%
+                </Text>
+              </Box>
+            }
+          />
+        )}
+      </SequenceCard>
     </Box>
   );
 }
diff --git a/src/app/hooks/useCallQuality.ts b/src/app/hooks/useCallQuality.ts
new file mode 100644
index 000000000..46af9c7d2
--- /dev/null
+++ b/src/app/hooks/useCallQuality.ts
@@ -0,0 +1,41 @@
+import { useEffect } from 'react';
+import { useAtomValue } from 'jotai';
+import { CallEmbed } from '../plugins/call';
+import { settingsAtom } from '../state/settings';
+import { useStateEvent } from './useStateEvent';
+import { StateEvent } from '../../types/matrix/room';
+import { buildQualityPayload, RoomQualityContent } from '../utils/callQuality';
+
+/**
+ * [P5-31] Apply the user's call quality settings (clamped by any room-level
+ * cap) to the Element Call fork via the `io.lotus.set_quality` widget action.
+ *
+ * The fork stores the settings and re-applies them on every (re)publish and
+ * reconnect, so we only need to (re)send when the payload changes or the widget
+ * becomes ready — no need to poll the track lifecycle here.
+ */
+export function useCallQuality(embed: CallEmbed): void {
+  const { callAudioBitrate, screenshareBitrate, screenshareFramerate } = useAtomValue(settingsAtom);
+
+  const roomQualityEvent = useStateEvent(embed.room, StateEvent.LotusRoomQuality);
+  const roomCaps = roomQualityEvent?.getContent<RoomQualityContent>();
+
+  // Depend on the primitive cap values (not the event object) so re-renders
+  // don't resend needlessly.
+  const audioCap = roomCaps?.audio_max_kbps;
+  const ssCap = roomCaps?.screenshare_max_kbps;
+  const fpsCap = roomCaps?.screenshare_max_fps;
+
+  useEffect(() => {
+    const payload = buildQualityPayload(
+      { callAudioBitrate, screenshareBitrate, screenshareFramerate },
+      { audio_max_kbps: audioCap, screenshare_max_kbps: ssCap, screenshare_max_fps: fpsCap },
+    );
+    const send = (): void => embed.control.setQuality(payload);
+    // Send now (settings are sticky fork-side even if tracks aren't up yet) and
+    // again once the widget signals ready, in case the transport wasn't up.
+    send();
+    const off = embed.onReady(send);
+    return off;
+  }, [embed, callAudioBitrate, screenshareBitrate, screenshareFramerate, audioCap, ssCap, fpsCap]);
+}
diff --git a/src/app/hooks/useSoundboard.ts b/src/app/hooks/useSoundboard.ts
new file mode 100644
index 000000000..e76d3fa45
--- /dev/null
+++ b/src/app/hooks/useSoundboard.ts
@@ -0,0 +1,101 @@
+import { useCallback, useEffect, useState } from 'react';
+import { useMatrixClient } from './useMatrixClient';
+import { useAccountDataCallback } from './useAccountDataCallback';
+import { AccountDataEvent } from '../../types/matrix/accountData';
+import {
+  SoundboardClip,
+  SoundboardContent,
+  SOUNDBOARD_MAX_CLIP_BYTES,
+  SOUNDBOARD_MAX_CLIPS,
+  SOUNDBOARD_NAME_MAX,
+  readSoundboardClips,
+} from '../utils/soundboardClips';
+
+const KEY = AccountDataEvent.LotusSoundboard;
+
+/**
+ * [P5-15] Read/write the user's personal soundboard, stored in the
+ * `io.lotus.soundboard` account data event (synced across devices like custom
+ * emoji/sticker packs). Uploading writes the audio to the media repo and
+ * appends an mxc reference.
+ */
+export function useSoundboard(): {
+  clips: SoundboardClip[];
+  addClip: (file: File, name?: string) => Promise<void>;
+  removeClip: (id: string) => Promise<void>;
+  renameClip: (id: string, name: string) => Promise<void>;
+} {
+  const mx = useMatrixClient();
+  const [clips, setClips] = useState<SoundboardClip[]>(() => readSoundboardClips(mx));
+
+  useAccountDataCallback(
+    mx,
+    useCallback((evt) => {
+      if (evt.getType() === KEY) {
+        const content = evt.getContent<SoundboardContent>();
+        setClips(Array.isArray(content?.clips) ? content.clips : []);
+      }
+    }, []),
+  );
+
+  useEffect(() => {
+    setClips(readSoundboardClips(mx));
+  }, [mx]);
+
+  const persist = useCallback(
+    async (next: SoundboardClip[]) => {
+      const content: SoundboardContent = { clips: next };
+      await (
+        mx as unknown as { setAccountData: (t: string, c: unknown) => Promise<void> }
+      ).setAccountData(KEY, content);
+    },
+    [mx],
+  );
+
+  const addClip = useCallback(
+    async (file: File, name?: string) => {
+      const current = readSoundboardClips(mx);
+      if (current.length >= SOUNDBOARD_MAX_CLIPS) {
+        throw new Error(`Soundboard is full (max ${SOUNDBOARD_MAX_CLIPS} clips).`);
+      }
+      if (file.size > SOUNDBOARD_MAX_CLIP_BYTES) {
+        throw new Error('Clip is too large (max 1 MB).');
+      }
+      const res = await mx.uploadContent(file, { type: file.type || 'audio/mpeg' });
+      const mxc = res.content_uri;
+      if (!mxc) throw new Error('Upload failed.');
+      const label = (name ?? file.name.replace(/\.[^/.]+$/, ''))
+        .trim()
+        .slice(0, SOUNDBOARD_NAME_MAX);
+      const clip: SoundboardClip = {
+        id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
+        name: label || 'Clip',
+        url: mxc,
+        mimetype: file.type || undefined,
+        size: file.size,
+      };
+      await persist([...current, clip]);
+    },
+    [mx, persist],
+  );
+
+  const removeClip = useCallback(
+    async (id: string) => {
+      const next = readSoundboardClips(mx).filter((c) => c.id !== id);
+      await persist(next);
+    },
+    [mx, persist],
+  );
+
+  const renameClip = useCallback(
+    async (id: string, name: string) => {
+      const trimmed = name.trim().slice(0, SOUNDBOARD_NAME_MAX);
+      if (!trimmed) return;
+      const next = readSoundboardClips(mx).map((c) => (c.id === id ? { ...c, name: trimmed } : c));
+      await persist(next);
+    },
+    [mx, persist],
+  );
+
+  return { clips, addClip, removeClip, renameClip };
+}
diff --git a/src/app/plugins/call/CallControl.ts b/src/app/plugins/call/CallControl.ts
index 53b190584..2ee2d4e8b 100644
--- a/src/app/plugins/call/CallControl.ts
+++ b/src/app/plugins/call/CallControl.ts
@@ -7,6 +7,17 @@ export enum CallControlEvent {
   StateUpdate = 'state_update',
 }
 
+/**
+ * [lotus #7 / P5-31] Payload for the fork's `io.lotus.set_quality` action.
+ * All fields optional; `null` clears that cap. Bits/sec for bitrates, fps for
+ * framerate.
+ */
+export type LotusQualityPayload = {
+  audioMaxBitrate?: number | null;
+  screenshareMaxBitrate?: number | null;
+  screenshareMaxFramerate?: number | null;
+};
+
 export class CallControl extends EventEmitter implements CallControlState {
   private state: CallControlState;
 
@@ -358,6 +369,33 @@ export class CallControl extends EventEmitter implements CallControlState {
     this.call.transport.send('io.lotus.focus_participant', { userId: null }).catch(() => undefined);
   }
 
+  /**
+   * [lotus #3 / P5-15] Inject a soundboard clip into the call so other
+   * participants hear it. The fork publishes it as a separate LiveKit audio
+   * track (`io.lotus.inject_audio`) rather than splicing the mic. `url` must be
+   * an https/blob URL the widget can fetch WITHOUT credentials — the host
+   * resolves an mxc clip to a `blob:` object URL first (authenticated media
+   * can't be fetched cross-realm by the widget). `volume` is 0–1.
+   *
+   * The local user does not hear their own published track, so callers should
+   * also play the clip locally for feedback.
+   */
+  public injectAudio(url: string, volume = 1): void {
+    this.call.transport.send('io.lotus.inject_audio', { url, volume }).catch(() => undefined);
+  }
+
+  /**
+   * [lotus #7 / P5-31] Apply audio/screenshare encoding limits to the local
+   * published tracks (the fork's `io.lotus.set_quality` action, via
+   * `RTCRtpSender.setParameters` — no republish). Bitrates are bits/sec,
+   * framerate is fps. A field set to `null` clears that cap. Settings are
+   * sticky fork-side (re-applied on every re-publish / reconnect). Values are
+   * clamped fork-side, so out-of-range input can't brick the encoder.
+   */
+  public setQuality(settings: LotusQualityPayload): void {
+    this.call.transport.send('io.lotus.set_quality', settings).catch(() => undefined);
+  }
+
   public dispose() {
     this.bodyMutationObserver.disconnect();
     this.controlMutationObserver.disconnect();
diff --git a/src/app/plugins/call/CallEmbed.ts b/src/app/plugins/call/CallEmbed.ts
index 6a35ae56a..4a81dd34d 100644
--- a/src/app/plugins/call/CallEmbed.ts
+++ b/src/app/plugins/call/CallEmbed.ts
@@ -179,6 +179,11 @@ export class CallEmbed {
       //  - transparent background so the room wallpaper shows through natively
       lotusCallState: 'true',
       lotusTransparent: 'true',
+      // [lotus #3 / P5-15] Arm the fork's audio-inject handler so the in-call
+      // soundboard can publish clips into the call. Dormant until the host
+      // sends io.lotus.inject_audio (only on an explicit user click), so
+      // arming it for every call is safe.
+      lotusAudioInject: 'true',
     });
 
     if (denoiseMode === 'ml') {
diff --git a/src/app/state/settings.ts b/src/app/state/settings.ts
index 6ceaab69b..947f8b4e1 100644
--- a/src/app/state/settings.ts
+++ b/src/app/state/settings.ts
@@ -24,6 +24,13 @@ export type DenoiseModelId = 'rnnoise' | 'speex' | 'dtln' | 'deepfilternet';
 // 'soft' / 'retro' are synthesized in-browser (see utils/ringtones.ts);
 // 'none' is silent (visual-only incoming-call UI).
 export type RingtoneId = 'classic' | 'chime' | 'soft' | 'retro' | 'none';
+// [P5-31] Granular call quality caps. 'auto' = don't cap (the EC fork keeps its
+// default encoding). Numbers are kbps (audio/screenshare bitrate) or fps
+// (screenshare framerate); converted to the fork's bits/sec + fps payload in
+// utils/callQuality.ts and applied via the io.lotus.set_quality widget action.
+export type CallAudioBitrate = 'auto' | '32' | '64' | '96' | '128' | '256';
+export type ScreenshareBitrate = 'auto' | '500' | '1500' | '3000' | '8000';
+export type ScreenshareFramerate = 'auto' | '15' | '30' | '60';
 export type ChatBackground =
   | 'none'
   | 'blueprint'
@@ -156,6 +163,14 @@ export interface Settings {
   ringtoneId: RingtoneId;
   ringtoneVolume: number; // 0–100
 
+  // [P5-31] Call quality controls
+  callAudioBitrate: CallAudioBitrate;
+  screenshareBitrate: ScreenshareBitrate;
+  screenshareFramerate: ScreenshareFramerate;
+  // [P5-15] In-call soundboard
+  soundboardEnabled: boolean;
+  soundboardVolume: number; // 0–100
+
   seasonalThemeOverride:
     | 'auto'
     | 'off'
@@ -253,6 +268,12 @@ const defaultSettings: Settings = {
   ringtoneId: 'classic',
   ringtoneVolume: 70,
 
+  callAudioBitrate: 'auto',
+  screenshareBitrate: 'auto',
+  screenshareFramerate: 'auto',
+  soundboardEnabled: true,
+  soundboardVolume: 80,
+
   seasonalThemeOverride: 'auto',
 };
 
diff --git a/src/app/utils/callQuality.test.ts b/src/app/utils/callQuality.test.ts
new file mode 100644
index 000000000..16f746b91
--- /dev/null
+++ b/src/app/utils/callQuality.test.ts
@@ -0,0 +1,60 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { buildQualityPayload } from './callQuality';
+
+describe('buildQualityPayload', () => {
+  it("sends null for every 'auto' field so a prior cap is reset", () => {
+    const payload = buildQualityPayload({
+      callAudioBitrate: 'auto',
+      screenshareBitrate: 'auto',
+      screenshareFramerate: 'auto',
+    });
+    assert.deepEqual(payload, {
+      audioMaxBitrate: null,
+      screenshareMaxBitrate: null,
+      screenshareMaxFramerate: null,
+    });
+  });
+
+  it('converts kbps user settings to bits/sec and passes fps through', () => {
+    const payload = buildQualityPayload({
+      callAudioBitrate: '64',
+      screenshareBitrate: '1500',
+      screenshareFramerate: '30',
+    });
+    assert.equal(payload.audioMaxBitrate, 64_000);
+    assert.equal(payload.screenshareMaxBitrate, 1_500_000);
+    assert.equal(payload.screenshareMaxFramerate, 30);
+  });
+
+  it('clamps the user setting down to the room cap (lower wins)', () => {
+    const payload = buildQualityPayload(
+      { callAudioBitrate: '256', screenshareBitrate: '8000', screenshareFramerate: '60' },
+      { audio_max_kbps: 64, screenshare_max_kbps: 1500, screenshare_max_fps: 30 },
+    );
+    assert.equal(payload.audioMaxBitrate, 64_000);
+    assert.equal(payload.screenshareMaxBitrate, 1_500_000);
+    assert.equal(payload.screenshareMaxFramerate, 30);
+  });
+
+  it('does not raise a user setting that is already below the room cap', () => {
+    const payload = buildQualityPayload(
+      { callAudioBitrate: '32', screenshareBitrate: 'auto', screenshareFramerate: '15' },
+      { audio_max_kbps: 128, screenshare_max_kbps: 3000, screenshare_max_fps: 60 },
+    );
+    assert.equal(payload.audioMaxBitrate, 32_000);
+    // user 'auto' but room caps screenshare bitrate -> room cap applies
+    assert.equal(payload.screenshareMaxBitrate, 3_000_000);
+    assert.equal(payload.screenshareMaxFramerate, 15);
+  });
+
+  it('applies a room cap even when the user left the field on auto', () => {
+    const payload = buildQualityPayload(
+      { callAudioBitrate: 'auto', screenshareBitrate: 'auto', screenshareFramerate: 'auto' },
+      { audio_max_kbps: 96 },
+    );
+    assert.equal(payload.audioMaxBitrate, 96_000);
+    assert.equal(payload.screenshareMaxBitrate, null);
+    assert.equal(payload.screenshareMaxFramerate, null);
+  });
+});
diff --git a/src/app/utils/callQuality.ts b/src/app/utils/callQuality.ts
new file mode 100644
index 000000000..1c614b2a5
--- /dev/null
+++ b/src/app/utils/callQuality.ts
@@ -0,0 +1,96 @@
+import { LotusQualityPayload } from '../plugins/call/CallControl';
+import { CallAudioBitrate, ScreenshareBitrate, ScreenshareFramerate } from '../state/settings';
+
+/**
+ * [P5-31] Room-level quality caps, stored in the `io.lotus.room_quality` state
+ * event. Admins set a ceiling every client must stay under. Values mirror the
+ * user-setting units (kbps / fps); `undefined`/absent = no cap.
+ *
+ * NOTE: the client applies these as a best-effort UX cap. Hard enforcement for
+ * ALL Matrix clients is a server-side follow-up (a `voice-limit-guard`-style
+ * sidecar on LXC 151 that reads this event) — see LOTUS_TODO.md P5-31.
+ */
+export type RoomQualityContent = {
+  // Numeric caps: client-cooperative only (our fork honors them; the SFU cannot
+  // enforce publisher bitrate/fps — LiveKit forwards, never transcodes).
+  audio_max_kbps?: number;
+  screenshare_max_kbps?: number;
+  screenshare_max_fps?: number;
+  // Publish-source policy: HARD-enforced server-side for ALL clients by the
+  // voice-limit-guard (it re-signs the LiveKit JWT's canPublishSources).
+  // Absent/true = allowed; only an explicit false forbids.
+  allow_screenshare?: boolean;
+  allow_camera?: boolean;
+};
+
+// Selectable options (kbps / fps), shared by the settings UI and the room-admin
+// UI so they stay in sync. Values are strings so they satisfy SettingsSelect's
+// `T extends string` constraint; parsed to numbers in buildQualityPayload.
+export const AUDIO_BITRATE_OPTIONS: { value: CallAudioBitrate; label: string }[] = [
+  { value: 'auto', label: 'Auto' },
+  { value: '32', label: '32 kbps' },
+  { value: '64', label: '64 kbps' },
+  { value: '96', label: '96 kbps' },
+  { value: '128', label: '128 kbps' },
+  { value: '256', label: '256 kbps' },
+];
+
+export const SCREENSHARE_BITRATE_OPTIONS: { value: ScreenshareBitrate; label: string }[] = [
+  { value: 'auto', label: 'Auto' },
+  { value: '500', label: '0.5 Mbps' },
+  { value: '1500', label: '1.5 Mbps' },
+  { value: '3000', label: '3 Mbps' },
+  { value: '8000', label: '8 Mbps' },
+];
+
+export const SCREENSHARE_FRAMERATE_OPTIONS: { value: ScreenshareFramerate; label: string }[] = [
+  { value: 'auto', label: 'Auto' },
+  { value: '15', label: '15 fps' },
+  { value: '30', label: '30 fps' },
+  { value: '60', label: '60 fps' },
+];
+
+/** Lower of two caps, treating `undefined` as "no cap on that side". */
+const minCap = (a: number | undefined, b: number | undefined): number | undefined => {
+  if (a === undefined) return b;
+  if (b === undefined) return a;
+  return Math.min(a, b);
+};
+
+/** Parse a setting value ('auto' | numeric string) to a number or undefined. */
+const num = (v: string): number | undefined => {
+  if (v === 'auto') return undefined;
+  const n = parseInt(v, 10);
+  return Number.isFinite(n) ? n : undefined;
+};
+
+type QualitySettings = {
+  callAudioBitrate: CallAudioBitrate;
+  screenshareBitrate: ScreenshareBitrate;
+  screenshareFramerate: ScreenshareFramerate;
+};
+
+/**
+ * Build the `io.lotus.set_quality` payload from the user's settings, clamped by
+ * any room-level cap. Every field is always present so clearing a setting back
+ * to 'auto' sends an explicit `null` that resets the fork-side cap (otherwise a
+ * previously-applied cap would stick for the rest of the call).
+ */
+export const buildQualityPayload = (
+  settings: QualitySettings,
+  roomCaps?: RoomQualityContent,
+): LotusQualityPayload => {
+  const userAudio = num(settings.callAudioBitrate);
+  const userSsBitrate = num(settings.screenshareBitrate);
+  const userSsFps = num(settings.screenshareFramerate);
+
+  const audioKbps = minCap(userAudio, roomCaps?.audio_max_kbps);
+  const ssKbps = minCap(userSsBitrate, roomCaps?.screenshare_max_kbps);
+  const ssFps = minCap(userSsFps, roomCaps?.screenshare_max_fps);
+
+  return {
+    audioMaxBitrate: audioKbps === undefined ? null : audioKbps * 1000,
+    screenshareMaxBitrate: ssKbps === undefined ? null : ssKbps * 1000,
+    screenshareMaxFramerate: ssFps === undefined ? null : ssFps,
+  };
+};
diff --git a/src/app/utils/soundboardClips.ts b/src/app/utils/soundboardClips.ts
new file mode 100644
index 000000000..a41630428
--- /dev/null
+++ b/src/app/utils/soundboardClips.ts
@@ -0,0 +1,72 @@
+import { MatrixClient } from 'matrix-js-sdk';
+import { downloadMedia, mxcUrlToHttp } from './matrix';
+
+/**
+ * [P5-15] A user-uploaded soundboard clip. Stored (as a list) in the
+ * `io.lotus.soundboard` account data event, so clips sync across a user's
+ * devices exactly like custom emoji / sticker packs.
+ */
+export type SoundboardClip = {
+  /** Stable local id (not shared with peers). */
+  id: string;
+  /** Display name / shortcode shown on the tile. */
+  name: string;
+  /** mxc:// URI of the uploaded audio. */
+  url: string;
+  mimetype?: string;
+  size?: number;
+};
+
+export type SoundboardContent = {
+  clips?: SoundboardClip[];
+};
+
+export const SOUNDBOARD_NAME_MAX = 24;
+/** Keep clips short: they publish to every peer and hold a track open. */
+export const SOUNDBOARD_MAX_CLIP_BYTES = 1024 * 1024; // 1 MB
+export const SOUNDBOARD_MAX_CLIPS = 40;
+export const SOUNDBOARD_ACCEPT = 'audio/mpeg,audio/ogg,audio/wav,audio/webm,audio/mp4,audio/aac';
+
+// Cache resolved object URLs per mxc so re-triggering a clip doesn't re-download
+// it. Object URLs live for the page session; the set is tiny (<= MAX_CLIPS).
+const objectUrlCache = new Map<string, string>();
+
+/**
+ * Resolve an mxc clip to a `blob:` object URL the Element Call widget can fetch
+ * without credentials. Authenticated media (MSC3916) can't be fetched from the
+ * widget's realm, so the host downloads it (auth handled by the service worker)
+ * and hands the widget a same-session blob URL instead.
+ */
+export const resolveClipObjectUrl = async (mx: MatrixClient, mxcUrl: string): Promise<string> => {
+  const cached = objectUrlCache.get(mxcUrl);
+  if (cached) return cached;
+
+  const httpUrl = mxcUrlToHttp(mx, mxcUrl, true);
+  if (!httpUrl) throw new Error('invalid mxc url');
+  const blob = await downloadMedia(httpUrl);
+  const objectUrl = URL.createObjectURL(blob);
+  objectUrlCache.set(mxcUrl, objectUrl);
+  return objectUrl;
+};
+
+/**
+ * Play a resolved clip locally so the person who pressed it gets immediate
+ * feedback — LiveKit doesn't loop a participant's own published track back to
+ * them, so without this the presser would hear nothing. `volume` is 0–1.
+ */
+export const playClipLocally = (objectUrl: string, volume: number): void => {
+  try {
+    const audio = new Audio(objectUrl);
+    audio.volume = Math.max(0, Math.min(1, volume));
+    audio.play().catch(() => undefined);
+  } catch {
+    /* best effort */
+  }
+};
+
+export const readSoundboardClips = (mx: MatrixClient): SoundboardClip[] => {
+  const content = mx.getAccountData('io.lotus.soundboard' as never)?.getContent() as
+    | SoundboardContent
+    | undefined;
+  return Array.isArray(content?.clips) ? content.clips : [];
+};
diff --git a/src/types/matrix/accountData.ts b/src/types/matrix/accountData.ts
index 987159964..0b755cdbf 100644
--- a/src/types/matrix/accountData.ts
+++ b/src/types/matrix/accountData.ts
@@ -10,6 +10,10 @@ export enum AccountDataEvent {
   PoniesUserEmotes = 'im.ponies.user_emotes',
   PoniesEmoteRooms = 'im.ponies.emote_rooms',
 
+  // [P5-15] Personal, uploadable in-call soundboard clips (synced across
+  // devices like custom emoji/sticker packs).
+  LotusSoundboard = 'io.lotus.soundboard',
+
   SecretStorageDefaultKey = 'm.secret_storage.default_key',
 
   CrossSigningMaster = 'm.cross_signing.master',
diff --git a/src/types/matrix/room.ts b/src/types/matrix/room.ts
index 79042672f..914f550be 100644
--- a/src/types/matrix/room.ts
+++ b/src/types/matrix/room.ts
@@ -41,6 +41,7 @@ export enum StateEvent {
   PoniesRoomEmotes = 'im.ponies.room_emotes',
   PowerLevelTags = 'in.cinny.room.power_level_tags',
   LotusVoiceLimit = 'io.lotus.voice_limit',
+  LotusRoomQuality = 'io.lotus.room_quality',
 }
 
 export enum MessageEvent {