audioCaptureDefaults set no channelCount, so Firefox captured a 2-channel audio interface (Scarlett Solo, one XLR mic on input 1) as stereo and, with browser audio processing off (the ML denoise tier), published it as is: peers heard the speaker in the left ear only. Chrome downmixes such captures itself, which is why it only showed on Firefox. Request channelCount: 1 for mic capture; screenshare audio is captured separately and is unaffected. Tested. Bumps to 0.25.0-lotus.3. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA