docs(04-01): complete audio system plan
- Add 04-01-SUMMARY.md with execution results - Update STATE.md with position, decisions, metrics - Update ROADMAP.md with plan progress - Mark AUDI-01 through AUDI-05 complete in REQUIREMENTS.md
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---
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phase: 04-polish-audio
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plan: 01
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subsystem: audio
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tags: [web-audio-api, web-speech-api, audiocontext, speech-synthesis, mute-button]
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# Dependency graph
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requires:
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- phase: 03-gameplay-loop
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provides: Settings store with audioEnabled, IndexedDB persistence
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provides:
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- Web Audio API sound effects module (playCorrectSound, playRewardSound, playForestElementSound)
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- Web Speech API text-to-speech module (speakText)
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- Mute button UI with persisted toggle state
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- AudioContext lazy initialization on first user interaction
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affects: [04-02, 04-03, 04-04]
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# Tech tracking
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tech-stack:
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added: [Web Audio API, Web Speech API]
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patterns: [lazy AudioContext initialization, settings-gated audio playback]
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key-files:
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created:
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- src/audio/sounds.ts
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- src/audio/speech.ts
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modified:
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- src/types.ts
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- index.html
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- src/styles/main.css
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- src/main.ts
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- src/api/gemini.ts
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- src/storage/db.test.ts
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- src/ui/parent.ts
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key-decisions:
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- "speechEnabled defaults to false (opt-in feature, not opt-out)"
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- "AudioContext created lazily on first click/keydown for autoplay policy compliance"
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- "All sound functions use try/catch with silent fallback (never throw)"
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patterns-established:
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- "Audio gating: every sound/speech function checks Settings before playing"
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- "Lazy AudioContext: initAudioOnInteraction() called from user event handlers"
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requirements-completed: [AUDI-01, AUDI-02, AUDI-03, AUDI-04, AUDI-05]
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# Metrics
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duration: 4min
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completed: 2026-03-29
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---
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# Phase 04 Plan 01: Audio System Summary
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**Web Audio API procedural sounds (correct/reward/forest) and Web Speech API German TTS with mute button and Settings persistence**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-03-29T16:14:40Z
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- **Completed:** 2026-03-29T16:18:48Z
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- **Tasks:** 2
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- **Files modified:** 9
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## Accomplishments
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- Three procedural Web Audio API sounds: correct keystroke beep (800Hz), ascending reward melody (C5-E5-G5-C6), filtered white noise for forest elements
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- German text-to-speech via Web Speech API with async voice loading and settings gate
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- Mute button with fixed-position circular UI, toggle persistence in IndexedDB, and visual state feedback
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Audio module + Speech module + Settings extension** - `c19b7fe` (feat)
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2. **Task 2: Mute button in HTML + CSS + wiring in main.ts** - `52596c5` (feat)
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## Files Created/Modified
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- `src/audio/sounds.ts` - Web Audio API sound effects with AudioContext lazy init
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- `src/audio/speech.ts` - Web Speech API speakText with German voice detection
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- `src/types.ts` - Added speechEnabled to Settings interface
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- `index.html` - Added mute-btn element outside all screen sections
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- `src/styles/main.css` - Mute button fixed-position styles
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- `src/main.ts` - Wired mute button toggle and AudioContext init on first interaction
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- `src/api/gemini.ts` - Added speechEnabled default to getDefaultSettings
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- `src/storage/db.test.ts` - Added speechEnabled to test Settings fixture
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- `src/ui/parent.ts` - Added speechEnabled defaults in inline Settings initializers
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## Decisions Made
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- speechEnabled defaults to false (opt-in) while audioEnabled defaults to true (opt-out) -- speech is more intrusive than sound effects
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- AudioContext is created lazily on first user interaction (click or keydown) to comply with browser autoplay policies
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- All audio functions wrap in try/catch and never throw to callers -- silent degradation preferred
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 2 - Missing Critical] Added speechEnabled defaults to all Settings initializers**
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- **Found during:** Task 1 (Settings extension)
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- **Issue:** Plan only mentioned adding speechEnabled to the types.ts interface, but several files create default Settings objects inline (gemini.ts, parent.ts, db.test.ts) that would fail type checking
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- **Fix:** Added speechEnabled: false to all inline Settings object literals across the codebase
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- **Files modified:** src/api/gemini.ts, src/storage/db.test.ts, src/ui/parent.ts
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- **Verification:** npx tsc --noEmit passes
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- **Committed in:** c19b7fe (Task 1 commit)
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---
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**Total deviations:** 1 auto-fixed (1 missing critical)
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**Impact on plan:** Essential for type safety. No scope creep.
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## Issues Encountered
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None
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- Audio system ready to be wired into lesson/reward/forest screens (Plan 04-02+)
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- Mute button functional and persisting state across reloads
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- speakText ready for companion dialogue integration
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## Self-Check: PASSED
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All created files exist, all commit hashes verified.
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---
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*Phase: 04-polish-audio*
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*Completed: 2026-03-29*
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