---
phase: 04-polish-audio
verified: 2026-03-29T18:25:00Z
status: human_needed
score: 5/5 must-haves verified
human_verification:
  - test: "Play a lesson and verify sounds play on correct keypress, reward screen, and new forest element"
    expected: "Short beep on correct key, ascending melody on reward, glitter sound on new element"
    why_human: "Web Audio API sounds cannot be verified without a running browser"
  - test: "Toggle mute button, reload, verify mute state persists"
    expected: "Icon changes, no sounds when muted, state survives reload"
    why_human: "Requires interactive browser session with audio output"
  - test: "Enable speechEnabled in settings, verify companion text is read aloud in German"
    expected: "German speech via Web Speech API for companion greeting and reward comment"
    why_human: "Speech synthesis requires audio output and browser TTS engine"
  - test: "Export progress, clear browser data, import the file, verify restoration"
    expected: "JSON file downloads, import restores progress after data loss"
    why_human: "Requires interactive file dialog and browser data clearing"
  - test: "Verify no unhandled exceptions during normal lesson flow"
    expected: "No error overlay appears, console clean during normal usage"
    why_human: "Requires running app end-to-end in browser"
  - test: "Verify leaf-fall sway animation and stardust particles visually"
    expected: "Letters sway side-to-side like leaves, sparkle particles on correct keypress"
    why_human: "Visual animation quality cannot be verified programmatically"
  - test: "Resize to <700px and verify responsive layout"
    expected: "Keyboard shrinks, fonts scale, grid adjusts"
    why_human: "Visual layout verification requires human judgment"
---

# Phase 04: Polish & Audio Verification Report

**Phase Goal:** Visuell und auditiv angenehmes Erlebnis, bereit zum Testen mit dem Kind
**Verified:** 2026-03-29T18:25:00Z
**Status:** human_needed
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths (from Success Criteria)

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Sounds spielen bei richtigem Tastendruck, Belohnung und neuem Waldelement; Mute-Button funktioniert und Zustand bleibt nach Reload | VERIFIED (code) | playCorrectSound called in screens.ts:217,293; playRewardSound in reward.ts:204; playForestElementSound in scene.ts:48; mute-btn wired in main.ts:24-54 with getSettings/saveSettings persistence |
| 2 | Buchstaben fallen sanft (keine ruckartigen Animationen), Sternenstaub-Animation erscheint bei Erfolg | VERIFIED (code) | @keyframes leaf-fall in main.css:331 with translateX sway; @keyframes stardust in main.css:388 on .falling-letter--dissolve pseudo-elements |
| 3 | Sprachausgabe liest Companion-Text vor wenn aktiviert (Web Speech API, Deutsch) | VERIFIED (code) | speakText in speech.ts:31-53 checks speechEnabled, uses de-DE, rate 0.9, pitch 1.1; called from reward.ts:208 and app.ts:219 |
| 4 | Export und Import funktionieren: Exportieren, Browser-Daten loeschen, Importieren, Fortschritt wiederhergestellt | VERIFIED (code) | exportData in parent.ts:242-262 creates JSON blob download; importData in parent.ts:267-301 validates + confirms + saves; resetAllData in parent.ts:318-324 double-confirms + clears 5 stores |
| 5 | Keine unbehandelten Exceptions in der Browser-Konsole bei normalem Gebrauch | VERIFIED (code) | Global error + unhandledrejection handlers in main.ts:6-16 show error-overlay; all audio functions use try/catch with silent fallback |

**Score:** 5/5 truths verified at code level

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `src/audio/sounds.ts` | Web Audio API sound effects | VERIFIED | 152 lines; exports playCorrectSound, playRewardSound, playForestElementSound, initAudioOnInteraction; all check audioEnabled via getSettings |
| `src/audio/speech.ts` | Web Speech API text-to-speech | VERIFIED | 53 lines; exports speakText; checks speechEnabled, uses de-DE, rate 0.9, pitch 1.1, async voice loading |
| `src/ui/parent.ts` | Export/Import/Reset functions | VERIFIED | 344 lines; exportData, importData (with validation), resetAllData (double confirm, 5 stores); all wired to buttons in loadParentData |
| `index.html` | Mute button + error overlay + data buttons | VERIFIED | mute-btn at line 194, error-overlay at line 186, export/import/reset buttons at lines 172-177 |
| `src/styles/main.css` | Animations + responsive + error overlay styles | VERIFIED | leaf-fall, stardust, companion-float keyframes; prefers-reduced-motion at line 1038; responsive @700px at line 1051; error-overlay + mute-btn styles |
| `src/main.ts` | Global error handler + mute button wiring | VERIFIED | Error handlers at lines 6-16; mute toggle with persistence at lines 24-54; AudioContext init on first interaction at lines 58-64 |
| `src/ui/screens.ts` | playCorrectSound on correct keypress | VERIFIED | Import at line 22; calls at lines 217, 293 (letter + word mode) |
| `src/forest/reward.ts` | playRewardSound + speakText | VERIFIED | Imports at lines 23-24; playRewardSound at line 204; speakText at line 208 |
| `src/forest/scene.ts` | playForestElementSound on new element | VERIFIED | Import at line 4; call at line 48 |
| `src/app.ts` | speakText for greeting | VERIFIED | Import at line 1; call at line 219 |
| `src/types.ts` | speechEnabled in Settings | VERIFIED | speechEnabled: boolean at line 56 |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| src/audio/sounds.ts | src/storage/db.ts | getSettings check for audioEnabled | WIRED | isAudioEnabled() at line 24-32 calls getSettings, checks audioEnabled |
| src/audio/speech.ts | src/storage/db.ts | getSettings check for speechEnabled | WIRED | speakText() at line 35-37 calls getSettings, checks speechEnabled |
| src/ui/screens.ts | src/audio/sounds.ts | import + call on correct keypress | WIRED | import at line 22, calls at lines 217, 293 |
| src/forest/reward.ts | src/audio/sounds.ts | import + call on reward | WIRED | import at line 23, call at line 204 |
| src/forest/reward.ts | src/audio/speech.ts | import + speakText for companion | WIRED | import at line 24, call at line 208 |
| src/forest/scene.ts | src/audio/sounds.ts | import + call on element appear | WIRED | import at line 4, call at line 48 |
| src/ui/parent.ts | src/storage/db.ts | getProgress/getSettings for export, save for import, clear for reset | WIRED | exportData uses getProgress+getSettings; importData uses saveProgress+saveSettings; resetAllData clears 5 stores |
| src/main.ts | src/audio/sounds.ts | initAudioOnInteraction on user interaction | WIRED | import at line 3, calls at lines 37, 59 |
| index.html | src/styles/main.css | error-overlay element + styles | WIRED | error-overlay div in HTML at line 186, styles in CSS at line 999 |

### Data-Flow Trace (Level 4)

| Artifact | Data Variable | Source | Produces Real Data | Status |
|----------|--------------|--------|--------------------|--------|
| src/audio/sounds.ts | audioEnabled | getSettings(db) from IndexedDB | Yes -- reads persisted Settings | FLOWING |
| src/audio/speech.ts | speechEnabled | getSettings(db) from IndexedDB | Yes -- reads persisted Settings | FLOWING |
| src/ui/parent.ts (export) | progress, settings | getProgress(db), getSettings(db) | Yes -- reads from IndexedDB stores | FLOWING |
| src/ui/parent.ts (import) | parsed JSON | file.text() + JSON.parse | Yes -- reads user-uploaded file | FLOWING |
| src/main.ts (mute) | audioEnabled | getSettings(db) + saveSettings | Yes -- reads/writes IndexedDB | FLOWING |

### Behavioral Spot-Checks

| Behavior | Command | Result | Status |
|----------|---------|--------|--------|
| TypeScript compiles | `npx tsc --noEmit` | Clean, no errors | PASS |
| All tests pass | `npx vitest run` | 85 tests passed across 7 files | PASS |
| Audio modules have correct exports | grep for exports | playCorrectSound, playRewardSound, playForestElementSound, initAudioOnInteraction, speakText all exported | PASS |
| Mute button in HTML | grep index.html | id="mute-btn" found at line 194 | PASS |
| Error overlay in HTML | grep index.html | id="error-overlay" found at line 186 with reload button | PASS |
| Export/Import/Reset buttons | grep index.html | export-btn, import-btn, reset-btn found at lines 172-177 | PASS |
| Audio wired into all screens | grep for imports | playCorrectSound in screens.ts, playRewardSound in reward.ts, playForestElementSound in scene.ts, speakText in app.ts+reward.ts | PASS |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|-----------|-------------|--------|----------|
| AUDI-01 | 04-01, 04-04 | Richtiger Tastendruck: Kurzer heller Ton (800Hz, 0.1s) | SATISFIED | playCorrectSound in sounds.ts (800Hz sine, 0.1s); called from screens.ts on correct keypress |
| AUDI-02 | 04-01, 04-04 | Belohnung: Aufsteigende Tonfolge (0.8s) | SATISFIED | playRewardSound in sounds.ts (C5-E5-G5-C6, 0.8s); called from reward.ts |
| AUDI-03 | 04-01, 04-04 | Neues Waldelement: Glitzer-Sound | SATISFIED | playForestElementSound in sounds.ts (filtered white noise, 0.5s); called from scene.ts |
| AUDI-04 | 04-01 | Mute-Button sichtbar, Zustand persistiert | SATISFIED | Mute button in index.html, wired in main.ts with getSettings/saveSettings persistence |
| AUDI-05 | 04-01, 04-04 | Optionale Sprachausgabe via Web Speech API (Deutsch) | SATISFIED | speakText in speech.ts (de-DE, rate 0.9, pitch 1.1); called from app.ts and reward.ts |
| PLSH-01 | 04-02 | Fallende Buchstaben als sanft schwebende CSS-Animation | SATISFIED | @keyframes leaf-fall with sinusoidal translateX sway in main.css |
| PLSH-02 | 04-02 | Erfolg-Animation: Sternenstaub/Glitzer via CSS particles | SATISFIED | @keyframes stardust on .falling-letter--dissolve ::before/::after in main.css |
| PLSH-03 | 04-02 | Begleitfigur-Avatar: Float-Animation | SATISFIED | @keyframes companion-float on .companion-area__avatar in main.css |
| PLSH-04 | 04-02 | Responsive bis 700px Breite | SATISFIED | @media (max-width: 700px) in main.css with keyboard/font/grid adjustments |
| PLSH-05 | 04-02 | Globaler Error-Handler: Kindgerechte Fehlermeldung | SATISFIED | Error + unhandledrejection handlers in main.ts; error-overlay with tree emoji + German message in index.html |
| PRNT-05 | 04-03 | Export: Fortschritt als JSON (ohne Blobs) | SATISFIED | exportData in parent.ts creates JSON with progress+settings only, downloads as zauberwald-backup.json |
| PRNT-06 | 04-03 | Import: JSON hochladen mit Validierung | SATISFIED | importData in parent.ts validates structure, confirms overwrite, saves+reloads |
| PRNT-07 | 04-03 | Reset: Alles loeschen mit doppelter Bestaetigung | SATISFIED | resetAllData in parent.ts with two confirm() dialogs, clears all 5 stores, reloads |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| src/ui/parent.ts | multiple | noNonNullAssertion (16 instances) | Info | Pre-existing project-wide pattern for DOM element access; not introduced by this phase; not a functional issue |

No TODOs, FIXMEs, placeholders, or stub implementations found in any phase 04 artifacts.

### Human Verification Required

### 1. Audio Playback at Correct Touch Points

**Test:** Start a lesson, type correct letters. Complete a lesson to see reward. Return to forest when new element appears.
**Expected:** Short beep on each correct key, ascending melody on reward screen, glitter sound when new forest element renders.
**Why human:** Web Audio API sounds require a browser with audio output.

### 2. Mute Button Persistence

**Test:** Click mute button (bottom-right corner), verify icon changes. Reload page, verify mute state persists.
**Expected:** Icon toggles between speaker and muted speaker; state survives page reload.
**Why human:** Requires interactive browser session to verify visual state and persistence.

### 3. Speech Synthesis for Companion Text

**Test:** Enable speechEnabled in settings (currently defaults to false), navigate to forest screen or complete a lesson.
**Expected:** Companion greeting and reward comment read aloud in German via Web Speech API.
**Why human:** TTS requires audio output and a browser with speech synthesis support.

### 4. Export/Import Round-Trip

**Test:** Open parent area (code 1234), click "Fortschritt exportieren", clear browser data (Application > Clear Storage), click "Fortschritt importieren" and select the exported file.
**Expected:** JSON file downloads, after import progress is restored (current level, sessions, character selection).
**Why human:** Requires interactive file dialogs and manual browser data clearing.

### 5. Leaf-Fall and Stardust Animation Quality

**Test:** Start a lesson, observe falling letters. Type correct letters and observe dissolve animation.
**Expected:** Letters sway side-to-side like leaves (not just float). Stardust sparkle particles appear on correct keypress dissolve.
**Why human:** Animation quality and smoothness require visual assessment.

### 6. Responsive Layout at 700px

**Test:** Resize browser window to less than 700px width.
**Expected:** Keyboard keys shrink, fonts scale down, grid columns adjust.
**Why human:** Layout responsiveness requires visual verification.

### 7. Error Overlay on Exception

**Test:** Open browser console and run `throw new Error('test')`.
**Expected:** Child-friendly overlay with tree emoji and "Oh, der Wald braucht kurz eine Pause..." message appears. Reload button works.
**Why human:** Requires running browser with dev console.

### Gaps Summary

No code-level gaps found. All 13 requirements are satisfied at the implementation level. All artifacts exist, are substantive (no stubs), are properly wired, and data flows through the connections.

The remaining verification is purely behavioral -- confirming that audio plays correctly, animations look smooth, and the export/import round-trip works in a real browser. These items cannot be verified programmatically and require human testing.

---

_Verified: 2026-03-29T18:25:00Z_
_Verifier: Claude (gsd-verifier)_