Lotus CIandClaude Opus 5.5
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Choosing an ML model (RNNoise / Speex / DTLN / DeepFilterNet) turned the browser's auto gain control off along with its noise suppressor, so the call carried the mic's raw level: voices came out 10-20 dB quieter than in the browser tier and DeepFilterNet "made people quiet". Measured with speech through each model exactly as the call runs it, the models keep the voice within ~1.5 dB (DTLN -0.1, DFN3 -1.7, RNNoise -1.3, Speex -1.5) while cutting background noise 6-29 dB, so the loss was AGC, not the models. Keep AGC on in every tier. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5