fix(mobile): fast track load + pitch-preserving tempo on chunked engine#242
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Three changes to chunkedAudioEngine.js: - CHUNK_SEC 10 -> 5: halves the initial chunk download (~10 MB -> ~5 MB for 6 stems), reducing the first-play buffering time. - ready() no longer blocks on chunk 0 download. It resolves after the parallel WAV header fetches (~6 x 1 KB) and kicks chunk 0/1 off in the background. play() already handled the not-yet-cached case, so first play is gapless once the background fetch finishes. Track appears ready in the UI in ~100 ms instead of several seconds. - Add SoundTouch WSOLA AudioWorklet on the master bus (same pattern as audioEngine.js) and expose setPlaybackRate(). The mobile speed slider was already wired to call this method, but it was missing from the API so the control silently did nothing. Pitch is now preserved at all speeds on mobile.
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Summary
engine.setPlaybackRate()but the method was missing from the API - voices and instruments now stay at original pitch when tempo changes.Test plan