Changelog

v0.1.0 — Peak-Locked Phase Vocoder Pitch Engine

Hand-rolled peak-locked phase vocoder in Zig replacing Apple's AVAudioUnitTimePitch.
The old unit sounded papery and harsh in the high end — like MP3 compression artifacts.
The new engine uses identity phase locking (Laroche–Dolson), transient preservation,
and Kaiser-windowed sinc resampling for transparent pitch shifting across ±1200 cents.
Mathematically transparent at 0 cents — the entire chain is a no-op within
float rounding error (verified at 3.1e-7 max error over 31k samples).
Peak locking keeps harmonics glued together — no phasey/underwater artifacts.
Transient detection resets phases on attacks — drums stay punchy, not smeared.
Stereo image preserved — analysis decisions run on the mid signal so L/R never
make conflicting phase choices.
76× realtime performance on M-series — negligible CPU cost.

Blackout on track switch: isFrozen was stuck true after pause, silently
dropping every visual frame on the next track. Now explicitly cleared on play().
Pitch-shifted playback on certain sample rates: the audio graph connected
playerNode → mainMixer with format: nil, defaulting to the hardware output
rate. 44.1 kHz files on 48 kHz systems played ~147 cents sharp. Now explicitly
connected with the file's real processing format.
Double-flush glitch at EOF: two buffers in flight both triggered EOF drain.
Added generation guard so only the first pump flushes.

bandCorrelations — per-band (bass/mid/high) Pearson correlation with
goniometer-shared two-pole IIR bandpass filters, replacing the old tripled
wideband correlation value.
Blinking fix: goniometer filter states now properly reset on track change.
Smoothing pipeline restored to original behavior — 90% visual smoothing
across all published metrics.

Download: TemperPlayer-v0.1.0.dmg below.
Drag to /Applications and launch. macOS may require right-click → Open on first run.