docs: mark tracker humanization task as IMPLEMENTED

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 8 deletions

diff --git a/TODO.md b/TODO.md
index 7d89e9e..2ee19ef 100644
--- a/TODO.md
+++ b/TODO.md
@@ -47,20 +47,22 @@ Enhanced CNN post-processing with multi-dimensional feature inputs.
 
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-## Priority 3: Tracker Humanization & Sample Offset
+## ~~Priority 3: Tracker Humanization & Sample Offset~~ [IMPLEMENTED]
 
 Enhance tracker with sample offset and humanization for realistic playback.
 
+**Status:** ✅ Both features implemented and tested (commit e9dde3c)
+
 **Features:**
-1. **Sample Offset:** Intrinsic offset value per sample (shifts trigger left, preserves beat sync)
-   - Add `offset_sec` to `NoteParams` (gen.h) and `Sample` struct
-   - Extend `.track` SAMPLE syntax: `SAMPLE <name> [OFFSET <sec>] [VOL <vol>]`
-   - Apply negative `start_offset_samples` in `trigger_note_event()`
+1. **Sample Offset (compile-time):** Intrinsic offset per sample, zero runtime cost
+   - `.track` syntax: `SAMPLE <name> OFFSET <sec>`
+   - Applied during compilation, preserves beat sync
 
-2. **Humanization:** Per-note random timing/volume variation (baked into WAV export)
-   - Add to `TrackerScore`: `humanize_seed`, `timing_variation_pct`, `volume_variation_pct`
+2. **Humanization (runtime, deterministic):** Per-note timing/volume variation
    - `.track` syntax: `HUMANIZE SEED <int> TIMING <pct> VOLUME <pct>`
-   - Apply per-event RNG modulation in `tracker_update()`
+   - Deterministic RNG ensures identical playback and WAV export
+
+**Test:** `data/test_humanize.track`
 
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