Add de-esser effect to the equalizer - #358
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Sibilance reduction for harsh "s"/"sh" sounds in narration, exposed as a 0-100% strength slider in the equalizer sheet's Effects section. Works like bass boost/loudness: independent of the band-EQ master switch, with per-book EQ, backup, and settings-sync support. Both platforms share the same DSP: an RBJ bandpass sidechain centered at 6 kHz (Q 1.1, ~4-9 kHz) feeds a 1 ms attack / 60 ms release envelope follower; above a strength-dependent threshold (-30 to -42 dBFS) up to 12 dB of the bandpassed signal is subtracted, so only the sibilance band is attenuated. Bypassed below 14 kHz sample rates (same Nyquist guard as the band EQ). iOS: new stage in the AbsorbAudioEQProcessor tap, folded into the anyProcessingActive gate so the tap attaches when the de-esser is the only active effect. Android: DeEsserAudioProcessor in the vendored just_audio sink chain (after Sonic and the channel mixer), toggled live via a DeEsserController static bridge like MonoController. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Summary
Adds sibilance reduction for harsh "s"/"sh" sounds in narration, exposed as a 0–100% strength slider in the equalizer sheet's Effects section. It behaves like bass boost/loudness: independent of the band-EQ master switch, with per-book EQ, backup, and settings-sync support.
Both platforms share the same DSP: an RBJ bandpass sidechain centered at 6 kHz (Q 1.1, ~4–9 kHz) feeds a 1 ms attack / 60 ms release envelope follower; above a strength-dependent threshold (−30 to −42 dBFS), up to 12 dB of the bandpassed signal is subtracted, so only the sibilance band is attenuated. Bypassed below 14 kHz sample rates (same Nyquist guard as the band EQ).
AbsorbAudioEQProcessortap, folded into theanyProcessingActivegate so the tap attaches when the de-esser is the only active effect.DeEsserAudioProcessorin the vendored just_audio sink chain (after Sonic and the channel mixer), toggled live via aDeEsserControllerstatic bridge likeMonoController.Testing
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