feat(player): playback speed control with pitch preservation#241
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Adds a speed slider to the transport footer (desktop) and mixer tab (mobile) so users can slow down or speed up tracks for practice. - audioEngine: store _playbackRate, apply to new AudioBufferSourceNodes on startSources(), and fix getCurrentTime() to account for rate so the waveform playhead and loop detection stay accurate at non-1x speeds - transport: applySpeed() propagates rate to both engine and streaming paths; scroll-wheel support (+-0.25 per tick); double-click resets to 1x - state: playbackSpeed variable + setter; speedEl/speedLabelEl DOM refs - player: resetSpeed() called in destroyPlayer() so a new track always starts at 1x - mobile: speed slider in mixer transport section, state.speed reset on track open
Voices and instruments no longer pitch-shift when changing playback speed. A WSOLA time-stretcher runs as an AudioWorkletProcessor on the master bus so a single node handles all stems. Falls back to tape-effect if the worklet API is unavailable.
thcp
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Summary
Adds a tempo (speed) control to the player for practice use cases - slow down or speed up tracks without pitch shifting.
Test plan