# Tasks: Automated Mix Calibration

## Phase 1: Foundation

- [x] 1.1 Create `src/calibrator/presets.py` — `VOLUME_PRESETS`, `EQ_PRESETS` (HPF/LPF freq per role), `PAN_PRESETS`, `SEND_PRESETS` dicts
- [x] 1.2 Add `calibrate: bool = True` optional field to `SongMeta` in `src/core/schema.py`
- [x] 1.3 Create `src/calibrator/__init__.py` with `Calibrator` class stub and `_resolve_role()` method (name → role key)

## Phase 2: Core Calibrator

- [x] 2.1 Implement `_calibrate_volumes(song)` — set track.volume from VOLUME_PRESETS by role; skip unknown roles
- [x] 2.2 Implement `_calibrate_pans(song)` — set track.pan from PAN_PRESETS by role
- [x] 2.3 Implement `_calibrate_sends(song)` — set track.send_level for reverb/delay return indices from SEND_PRESETS
- [x] 2.4 Implement `_calibrate_eq(song)` — prepend ReaEQ PluginDef with params dict (HPF/LPF) to track.plugins; skip return tracks
- [x] 2.5 Implement `_swap_master_chain(song)` — replace master_plugins with Ozone 12 triplet; fall back to Pro-Q_3/Pro-C_2/Pro-L_2 if Ozone not in PLUGIN_REGISTRY
- [x] 2.6 Implement `Calibrator.apply(song)` orchestrating all _calibrate_* methods, returning the mutated song

## Phase 3: Builder & Integration

- [x] 3.1 Modify `_build_plugin()` in `src/reaper_builder/__init__.py` — read `PluginDef.params` for built-in VST2 plugins and populate param_slots
- [x] 3.2 Wire calibrator into `scripts/compose.py` — import Calibrator, call `calibrator.apply(song)` after track construction, before RPPBuilder
- [x] 3.3 Add `--no-calibrate` flag to compose.py argparse; when set, skip calibrator call and SongMeta.calibrate=False

## Phase 4: Testing

- [x] 4.1 Create `tests/test_calibrator.py` — unit tests for `_resolve_role()`, each `_calibrate_*()` method against fixture SongDefinition
- [x] 4.2 Test `Calibrator.apply()` end-to-end — volumes, pans, sends, ReaEQ presence, master plugins all match presets
- [x] 4.3 Test `--no-calibrate` flag — calibrator not called, master_plugins unchanged
- [x] 4.4 Test Ozone fallback — mock empty Ozone registry entries, verify Pro-Q_3/Pro-C_2/Pro-L_2 used
- [x] 4.5 Run existing test suite — verify all 110+ tests still pass