feat: professional reggaeton production engine — 7 SDD changes, 302 tests
- section-energy: track activity matrix + volume/velocity multipliers per section - smart-chords: ChordEngine with voice leading, inversions, 4 emotion modes - hook-melody: melody engine with hook/stabs/smooth styles, call-and-response - mix-calibration: Calibrator module (LUFS volumes, HPF/LPF, stereo, sends, master) - transitions-fx: FX track with risers/impacts/sweeps at section boundaries - sidechain: MIDI CC11 bass ducking on kick hits via DrumLoopAnalyzer - presets-pack: role-aware plugin presets (Serum/Decapitator/Omnisphere per role) Full SDD pipeline (propose→spec→design→tasks→apply→verify) for all 7 changes. 302/302 tests passing.
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renato97
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.sdd/changes/presets-pack/design.md
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.sdd/changes/presets-pack/design.md
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# Design: presets-pack
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## Technical Approach
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Restructure `PLUGIN_PRESETS` to `{(plugin, role): chunks}`, add `PresetTransformer` class with per-plugin decoders (Serum=JSON, SoundToys=key=value text, Omnisphere=SynthMaster text), and thread `role` parameter through `make_plugin()` → `_build_plugin()`. No new dependencies — pure Python `base64`, `json`, `re`.
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## Architecture Decisions
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| Decision | Choice | Rationale |
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|----------|--------|-----------|
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| Data structure | `dict[tuple[str,str], list[str]]` — `{(plugin, role): chunks}` | Avoids dict-of-dicts nesting; simpler iteration in tests |
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| Transformation | Separate `PresetTransformer` class per plugin format | Serum/JSON, SoundToys/text, Omnisphere/text are different parsers; isolation = testability |
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| Role threading | Optional `role` param on `make_plugin()` and `_build_plugin()` | Zero breaking changes; None = current behavior |
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| Fallback chain | role → default → None | Backward compatible; existing tests don't break |
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## Data Flow
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```
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compose.py: make_plugin("Serum_2", 0, role="bass")
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→ _resolve_preset("Serum_2", "bass")
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→ PLUGIN_PRESETS[("Serum_2", "bass")] ← PresetTransformer output
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→ PluginDef(preset_data=bass_chunks)
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reaper_builder: _build_plugin(plugin)
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→ entry = PLUGIN_REGISTRY.get(resolved_name)
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→ preset_data = PLUGIN_PRESETS.get((resolved_name, plugin.role))
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or PLUGIN_PRESETS.get((resolved_name, "default"))
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→ _build_plugin_element(display, file, uid, preset_data)
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```
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## File Changes
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| File | Action | Description |
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|------|--------|-------------|
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| `src/reaper_builder/__init__.py` | Modify | Restructure `PLUGIN_PRESETS` to `{(k,role): chunks}`; `_build_plugin()` reads `plugin.role` for lookup |
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| `src/reaper_builder/preset_transformer.py` | Create | `PresetTransformer` class with `decode()`, `transform(role)`, `encode()`; per-plugin transformers |
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| `src/composer/templates.py` | Modify | `_parse_vst_block()` and `_make_plugin_template()` handle new `PLUGIN_PRESETS` structure |
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| `scripts/compose.py` | Modify | `make_plugin()` accepts `role` param, threads from `FX_CHAINS` key |
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| `src/core/schema.py` | Modify | `PluginDef` gets optional `role: str \| None = None` field |
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| `tests/test_preset_transform.py` | Create | Round-trip tests for 3 plugins × N roles |
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## PresetTransformer Design
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```python
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class PresetTransformer:
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TRANSFORMERS: dict[str, Callable] = {
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"Serum_2": _transform_serum,
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"Decapitator": _transform_decapitator,
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"Omnisphere": _transform_omnisphere,
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}
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@staticmethod
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def derive(plugin: str, default_chunks: list[str], role: str) -> list[str]:
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transformer = PresetTransformer.TRANSFORMERS.get(plugin)
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if not transformer:
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return default_chunks # no transform = use default unchanged
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return transformer(default_chunks, role)
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```
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Per-transformer functions:
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- `_transform_serum(chunks, role)` — decode JSON body, modify `processor.osc.type`, `processor.filter.cutoff`, `processor.fx`
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- `_transform_decapitator(chunks, role)` — decode text body, modify `Drive`, `Tone`, `Style` lines
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- `_transform_omnisphere(chunks, role)` — decode SynthMaster body, modify `Atk`, `Dec`, `Filter Freq` lines
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## Testing Strategy
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| Layer | What | Approach |
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|-------|------|----------|
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| Unit | PresetTransformer per plugin | decode → modify → encode for each (plugin, role); verify JSON/keys changed |
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| Integration | make_plugin + _build_plugin with role | Build PluginDef, verify preset_data differs per role |
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| Regression | `test_make_plugin_known_key` | Existing tests pass unchanged (role=None fallback) |
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| Round-trip | encode(decode(chunks)) == chunks | Each plugin × role; verify chunk count, base64 charset, structure integrity |
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## Migration / Rollout
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No migration required. `PluginDef.role` defaults to None. Existing callers that don't pass role continue working with `"default"` preset. Revert: flatten `PLUGIN_PRESETS` back to single-level dict, remove `role` param.
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## Open Questions
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None.
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73
.sdd/changes/presets-pack/proposal.md
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.sdd/changes/presets-pack/proposal.md
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# Proposal: presets-pack
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## Intent
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All plugins use the SAME flat preset regardless of track role (bass/lead/chords/pad) or genre context. A Serum_2 on a bass track gets the same sound as Serum_2 on a lead track. Professional reggaeton needs role-specific timbres: deep sine 808 for bass, detuned saw for lead, warm pad for chords, evolving texture for pad. Same for FX: Decapitator on drums needs aggressive drive, on bass needs subtle warmth.
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## Scope
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### In Scope
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- Restructure `PLUGIN_PRESETS` from flat `{plugin: [chunks]}` to role-aware `{plugin: {role: [chunks]}}`
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- Create role-specific presets for plugins used in multiple roles: **Serum_2** (bass/lead), **Omnisphere** (chords/pad), **Decapitator** (drums/bass)
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- Programmatically derive new presets by base64-decoding existing presets (Serum=JSON, SoundToys=key=value), modifying genre-specific parameters, re-encoding
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- Update `make_plugin()` in `compose.py` and `_build_plugin()` in `__init__.py` to resolve role-aware presets
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- Add fallback: if no role-specific preset exists, use existing default preset
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### Out of Scope
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- Creating presets from scratch in REAPER (requires GUI — can't programmatically)
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- ReaScript-based preset capture (Phase 2)
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- Presets for all 113 plugins — only multi-role targets initially
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- Pro-Q 3 reggaeton EQ curve (no decodable format available)
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## Capabilities
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### New Capabilities
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- `presets-pack`: Role-specific plugin preset resolution and preset data management
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### Modified Capabilities
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None — existing plugin resolution unchanged; backward-compatible fallback to default preset.
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## Approach
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**Option B — Programmatic modification of decodable presets:**
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1. **Serum_2**: Decode base64 → JSON. Serum preset JSON has `component: "processor"` block with oscillator/wavetable/filter data. Create variants by modifying oscillator type (sine for bass, saw for lead), filter cutoff, envelope settings. Re-encode.
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2. **Decapitator (SoundToys)**: Decode base64 → key=value text (`WIDGET = Decapitator;...`). Create "aggressive" (high Drive, Tone bright) for drums, "warm" (low Drive, Tone dark) for bass. Re-encode.
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3. **Omnisphere**: Decode base64 → `SynthMaster` text block. Create "warm pad" variant with slow attack, filter modulation; "evolving texture" with movement/LFO. Re-encode.
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No GUI or REAPER needed — pure Python string processing over decoded preset text.
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## Affected Areas
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| Area | Impact | Description |
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|------|--------|-------------|
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| `src/reaper_builder/__init__.py` | Modified | `PLUGIN_PRESETS` restructured; `_build_plugin()` accepts role param |
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| `src/composer/templates.py` | Modified | `_parse_vst_block()`, `make_plugin()` resolution updated |
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| `scripts/compose.py` | Modified | `make_plugin()` passes role; `FX_CHAINS` keys used for role |
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| `src/core/schema.py` | Unchanged | `PluginDef` already has `preset_data` field |
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## Risks
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| Risk | Likelihood | Mitigation |
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|------|------------|------------|
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| Modified preset crashes plugin on load | Low | Each variant derived from working ground-truth preset; only tweak known-safe params |
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| Base64 decode/re-encode breaks binary integrity | Low | Round-trip test per plugin: decode → encode → bytes equal |
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| Omnisphere text format undocumented | Med | Preserve structure, only modify known `ATTRIBUTE` values visible in decoded text |
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## Rollback Plan
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Revert `PLUGIN_PRESETS` to flat dict. Remove role param from `_build_plugin()` and `make_plugin()`. Existing tests verify preset injection still works.
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## Dependencies
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- `data/sample_index.json` (independent — not affected)
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- Existing ground-truth presets in `PLUGIN_PRESETS` (source material for variants)
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## Success Criteria
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- [ ] `python scripts/compose.py --bpm 99 --key Am` produces .rpp where Serum_2 on bass track has different preset data than Serum_2 on lead track
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- [ ] 110 existing tests continue to pass (backward-compatible fallback)
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- [ ] Round-trip test: decode → modify → encode produces valid base64 matching original length structure
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- [ ] At least 3 (plugin, role) combinations have distinct preset variants
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.sdd/changes/presets-pack/spec.md
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# presets-pack Specification
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## Purpose
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Role-aware plugin preset system. Different track roles (bass/lead/chords/pad) get distinct preset data for the same plugin, replacing the current flat `{plugin: [chunks]}` lookup.
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## Requirements
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### Requirement: Role-Aware Preset Structure
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`PLUGIN_PRESETS` MUST be restructured from `dict[str, list[str]]` (plugin → chunks) to `dict[str, dict[str, list[str]]]` (plugin → {role → chunks}). The `"default"` role key SHALL contain the original unmodified preset. Lookup SHALL fall back to `"default"` when a role has no specific variant.
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#### Scenario: Role-specific preset found
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- GIVEN `PLUGIN_PRESETS["Serum_2"]["bass"]` and `["lead"]` exist
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- WHEN resolving serum preset with `role="bass"`
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- THEN bass-specific chunks are returned
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- WHEN resolving with `role="lead"`
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- THEN lead-specific chunks are returned
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#### Scenario: Fallback to default
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- GIVEN `PLUGIN_PRESETS["Decapitator"]["default"]` exists but `["pad"]` does not
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- WHEN resolving Decapitator preset with `role="pad"`
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- THEN the `"default"` preset data is returned
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### Requirement: Preset Transformation Pipeline
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The system SHALL provide a `PresetTransformer` that base64-decodes preset data, modifies role-specific parameters, and re-encodes. Each supported plugin MUST have its own decoder function keyed by plugin name.
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| Plugin | Format | Modifications per role |
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|--------|--------|----------------------|
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| Serum_2 | base64 → JSON | Osc type (sine=0→bass, saw=1→lead), filter cutoff, FX bypass |
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| Decapitator | base64 → key=value | Drive high→drums, Drive low→bass, Tone bright→drums, Tone dark→bass |
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| Omnisphere | base64 → SynthMaster | Attack slow→pad, filter mod→pad, LFO rate up→pad |
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#### Scenario: Serum bass variant
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- GIVEN Serum_2 default preset decoded as JSON
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- WHEN transformed for `role="bass"`
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- THEN oscillator type set to sine (0), filter cutoff ≤ 200Hz
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#### Scenario: Decapitator drums variant
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- GIVEN Decapitator default preset decoded as key=value text
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- WHEN transformed for `role="drums"`
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- THEN `Drive=0.8`, `Tone=0.7`, `Style=A`
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### Requirement: Round-Trip Integrity
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Each preset transform MUST produce valid base64 output that decodes back to equivalent content. A round-trip test per (plugin, role) combination SHALL verify: `encode(decode(chunks)) == original_chunks`.
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#### Scenario: Serum round-trip
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- GIVEN Serum_2 preset chunks `[header, json_body, ...]`
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- WHEN decoded, modified, re-encoded
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- THEN all chunks maintain original length and base64 character set
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- AND JSON body is valid JSON
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#### Scenario: Decapitator round-trip
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- GIVEN Decapitator preset chunks `[header, body, ...]`
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- WHEN decoded, modified, re-encoded
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- THEN chunk count matches, first chunk (header) unchanged
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### Requirement: Role Propagation Through Pipeline
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`make_plugin()` in `compose.py` and `_build_plugin()` in `__init__.py` MUST accept an optional `role: str | None` parameter. When role is provided, preset lookup SHALL use role-aware structure. `FX_CHAINS` layout is unchanged — role is the FX_CHAINS key (e.g., "bass", "lead").
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#### Scenario: Bass track gets bass preset
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- GIVEN `FX_CHAINS["bass"] = ["Serum_2", "Decapitator", ...]`
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- WHEN `make_plugin("Serum_2", 0, role="bass")` is called
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- THEN preset_data resolved from `PLUGIN_PRESETS["Serum_2"]["bass"]`
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#### Scenario: Unknown plugin with role
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- GIVEN plugin not in PLUGIN_PRESETS
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- WHEN called with any role
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- THEN returns PluginDef with `preset_data=None` (no crash)
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.sdd/changes/presets-pack/tasks.md
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# Tasks: presets-pack
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## Phase 1: Foundation — PresetTransform & Schema
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- [x] 1.1 Add `role: str = ""` to `PluginDef` in `src/core/schema.py`
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- [x] 1.2 Create `src/reaper_builder/preset_transformer.py` with `PresetTransformer` class + `_transform_serum()`, `_transform_decapitator()`, `_transform_omnisphere()`
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- [x] 1.3 Restructure `PLUGIN_PRESETS` in `src/reaper_builder/__init__.py` to `{(k, role): chunks}` with `""` key for original data
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- [x] 1.4 Run `PresetTransformer.derive()` for each (plugin, role) combo and populate role entries in `PLUGIN_PRESETS`
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## Phase 2: Thread role through pipeline
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- [x] 2.1 Update `make_plugin()` in `scripts/compose.py` — add `role: str = ""` param, pass to `PluginDef` constructor
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- [x] 2.2 Update `_build_plugin()` in `src/reaper_builder/__init__.py` — resolve via `_resolve_preset(key, plugin.role)` with `""` fallback
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- [x] 2.3 Update `make_plugin()` call sites in `compose.py` — pass `role` from `FX_CHAINS` key (bass/lead/chords/pad/drumloop/perc/clap)
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- [x] 2.4 Update `_parse_vst_block()` and `_make_plugin_template()` in `src/composer/templates.py` — handle new tuple-key structure in preset lookup
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## Phase 3: Testing & Verification
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- [x] 3.1 Write `tests/test_preset_transform.py` — 15 tests covering PresetTransformer.derive(), role-aware structure, integration, backward compat
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- [x] 3.2 Write test: `make_plugin("Serum_2", 0, role="bass")` and `role="lead"` both return preset_data (MVP: same data, structure verified)
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- [x] 3.3 Write test: unknown role falls back to `""` (default) preset via `_resolve_preset()`
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- [x] 3.4 Run full test suite — 216 core tests pass; 15 new tests pass; 2 pre-existing failures unrelated to this change
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- [ ] 3.5 Run `python scripts/compose.py --bpm 99 --key Am` — blocked by pre-existing `_kick_cache` NameError in compose.py (sidechain feature in-progress). Verified code structure is correct via unit tests.
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