Phase 22-23: Complete Synthesis Engine + Percussion Expansion#17
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Phase 22-23: Complete Synthesis Engine + Percussion Expansion#17
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## New Documentation - Create specs/research/INSTRUMENT-EXPANSION.md (~700 lines) - Complete implementation patterns for all 5 instrument types - Procedural synthesis code for 6 percussion samples - Verified sample sources (U of Iowa, VSCO 2, Philharmonia, Freesound, Pianobook) - Feature synergy matrix and prioritized instrument list - Demo session fix guide ## Roadmap Changes - Add Phase 23: Percussion Expansion & Demo Fix - 6 procedural percussion samples (shaker, conga, tambourine, clave, cabasa, woodblock) - Fixes 3 broken demo sessions - ~4 hours effort, zero bundle size increase - Restructure Phase 24: Polish & Production - Expanded with detailed UI wireframes - Added implementation code snippets - Success criteria added - Archive Shared Sample Recording to specs/archive/ - Preserved full spec for future reference - Removed from active roadmap - Move Instrument Library Expansion to Phase 34 - Lower priority than core features - Expanded with tier breakdown and verified sources - Remove velocity layers (never implemented, incorrectly documented) - Renumber phases 26-35 to fill gaps ## Documentation Updates - Fix Phase 22 terminology: "velocity layers" → "pitch samples" - Update all Phase 25 references to Phase 26 - Update MUSICAL-COVERAGE-ANALYSIS.md with correct instrument count (68) - Add cross-references between related documents 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Update Phase 22 to explicitly credit XY Pad component, Effects bypass, and LRU sample cache as complete - Add LRU cache to Audio Infrastructure section with details - Update Phase 22 summary table with all completed features - Rewrite Phase 24 to show only remaining work (removed ALREADY BUILT sections) - Renumber Phase 24 sections (2->1, 3->2, 4->3) - Update success criteria to reflect actual remaining work 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add shaker, conga, tambourine, clave, cabasa, and woodblock to unlock Latin, Afrobeat, and World music genres. All instruments are procedurally generated (zero bundle size impact). Implementation: - samples.ts: 6 new create*() functions with calibrated volume/ADSR - types.ts: Add to SAMPLE_CATEGORIES.drums (now 14 drums) - sample-constants.ts: Add to INSTRUMENT_CATEGORIES and SAMPLE_NAMES - session-api.ts: Add to VALID_SAMPLE_IDS for validation Bug fixes: - Fix synth:piano → sampled:piano in extended-afrobeat.json - Fix synth:piano → sampled:piano in progressive-house-build.json New demo session: - latin-percussion-showcase.json: Demonstrates all 6 new instruments Test updates: - samples.test.ts: 16 → 22 samples, 8 → 14 drums - instrument-routing.test.ts: 68 → 74 total instruments Volume calibration: - Shaker: 0.6 (background texture) - Conga: 0.7 (similar to tom) - Tambourine: ~0.6 (metallic jingles) - Clave: 0.6 (sharp click) - Cabasa: 0.5 (subtle texture) - Woodblock: 0.7-1.0 (resonant) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
This PR delivers a comprehensive enhancement to Keyboardia's audio capabilities:
Phase 22: Synthesis Engine
Phase 23: Percussion Expansion
latin-percussion-showcase.jsonInfrastructure Improvements
Documentation
Test Plan
npm run test:all- all tests pass🤖 Generated with Claude Code