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@@ -3,6 +3,26 @@ This file tracks prioritized tasks with detailed attack plans. ## Recently Completed (February 4, 2026) +- [x] **Event-Based Tracker for Tempo Scaling**: + - [x] **Problem Identified**: Notes within patterns didn't accelerate with tempo changes. Pattern events were pre-composited into single spectrograms at fixed positions. + - [x] **Refactored Architecture**: Changed from pattern compositing to individual event triggering. Each TrackerEvent now triggers as separate voice. + - [x] **Dynamic Beat Calculation**: `elapsed_beats = (music_time - start_time) / beat_duration` allows notes to respect tempo scaling. + - [x] **ActivePattern Tracking**: Added structure to track pattern_id, start_music_time, and next_event_idx for each active pattern instance. + - [x] **Removed Compositing Logic**: Deleted paste_spectrogram approach that baked events at fixed frame offsets. + - [x] **Full Tempo Scaling**: At 2.0x tempo, both pattern triggering AND note spacing play 2x faster. At 0.5x tempo, both play 2x slower. + - [x] **Testing**: Updated test_tracker.cc to verify individual event triggers at specific beat times. All 17 tests pass. + - [x] **WAV Verification**: Confirmed with WAV dump showing 61.24s music time in 60s physical time during tempo transitions. + +- [x] **WAV Dump Backend for Debugging**: + - [x] **Implementation**: Created WavDumpBackend implementing AudioBackend interface to render audio offline to .wav files. + - [x] **Command-Line Option**: Added `--dump_wav output.wav` flag to enable offline rendering instead of live playback. + - [x] **Stereo Bug Fix**: Fixed critical mono/stereo mismatch. Synth outputs STEREO (interleaved L/R) but initial implementation wrote MONO. + - [x] **Correct Allocation**: Changed to allocate `frames * 2` samples and write stereo format (num_channels = 2). + - [x] **Format Matching**: WAV header now correctly specifies 16-bit PCM, stereo, 32kHz (matches live audio exactly). + - [x] **Regression Test**: Added test_wav_dump.cc with critical assertion `assert(header.num_channels == 2)` to prevent future mismatches. + - [x] **Tempo Simulation**: WAV dump backend simulates tempo scaling matching main.cc logic for accurate offline rendering. + - [x] **All Tests Pass**: 17/17 tests pass including WAV format verification. + - [x] **Variable Tempo System**: - [x] **Music Time Abstraction**: Implemented unified music time in `main.cc` that advances at `tempo_scale` rate, decoupling from physical time. - [x] **Tempo Control**: Added `g_tempo_scale` (default 1.0) allowing future dynamic tempo changes without pitch shifting. |