docs(27): complete Backing Track Sync phase
- Phase 27 verified: 2/2 must-haves confirmed - BT-01: openBackingTrack action enables session screen sync - BT-02: ignore flag prevents unmount warnings - ROADMAP.md, STATE.md, REQUIREMENTS.md updated Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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@ -16,8 +16,8 @@ Requirements for polishing media player features. Each maps to roadmap phases.
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### Backing Track Fixes
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- [ ] **BT-01**: Use openBackingTrack() action to enable track sync to session screen
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- [ ] **BT-02**: Add ignore flag to duration fetch useEffect
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- [x] **BT-01**: Use openBackingTrack() action to enable track sync to session screen ✓
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- [x] **BT-02**: Add ignore flag to duration fetch useEffect ✓
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### Metronome Fixes
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@ -50,8 +50,8 @@ Explicitly excluded for this milestone.
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| JT-02 | Phase 26 | Complete |
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| JT-03 | Phase 26 | Complete |
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| JT-04 | Phase 26 | Complete |
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| BT-01 | Phase 27 | Pending |
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| BT-02 | Phase 27 | Pending |
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| BT-01 | Phase 27 | Complete |
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| BT-02 | Phase 27 | Complete |
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| MET-01 | Phase 28 | Pending |
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| MET-02 | Phase 28 | Pending |
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@ -17,7 +17,7 @@ v1.6 addresses usability issues reported in three media features: JamTrack (load
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## Phases
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- [x] **Phase 26: JamTrack Polish** - Fix loading sequence, sizing, navigation, and cleanup ✓
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- [ ] **Phase 27: Backing Track Sync** - Enable track sync and async cleanup
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- [x] **Phase 27: Backing Track Sync** - Enable track sync and async cleanup ✓
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- [ ] **Phase 28: Metronome Responsiveness** - Debounce controls and cleanup timers
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## Phase Details
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@ -49,7 +49,7 @@ Plans:
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**Plans**: 1 plan
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Plans:
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- [ ] 27-01-PLAN.md - Use openBackingTrack action and add async cleanup
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- [x] 27-01-PLAN.md - Use openBackingTrack action and add async cleanup ✓
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### Phase 28: Metronome Responsiveness
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**Goal**: Metronome controls respond smoothly to user input
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@ -71,7 +71,7 @@ Plans:
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| Phase | Milestone | Plans Complete | Status | Completed |
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|-------|-----------|----------------|--------|-----------|
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| 26. JamTrack Polish | v1.6 | 4/4 | Complete | 2026-02-25 |
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| 27. Backing Track Sync | v1.6 | 0/1 | Planned | - |
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| 27. Backing Track Sync | v1.6 | 1/1 | Complete | 2026-02-26 |
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| 28. Metronome Responsiveness | v1.6 | 0/TBD | Not started | - |
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---
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@ -0,0 +1,88 @@
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---
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phase: 27-backing-track-sync
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verified: 2026-02-26T11:53:24Z
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status: passed
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score: 2/2 must-haves verified
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---
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# Phase 27: Backing Track Sync Verification Report
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**Phase Goal:** Backing Track appears in session screen when opened
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**Verified:** 2026-02-26T11:53:24Z
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**Status:** passed
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**Re-verification:** No - initial verification
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## Goal Achievement
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### Observable Truths
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| # | Truth | Status | Evidence |
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|---|-------|--------|----------|
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| 1 | Opening a backing track file shows the track in session screen (not just popup) | VERIFIED | `handleBackingTrackSelected` at line 1137 calls `await openBackingTrack(result.file)` which triggers `syncTracksToServer` in useMediaActions hook |
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| 2 | No "state update on unmounted component" warnings when closing backing track quickly | VERIFIED | JKSessionBackingTrackPlayer.js useEffect at line 90 has `let ignore = false` declaration and cleanup function at line 155-157 sets `ignore = true` |
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**Score:** 2/2 truths verified
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### Required Artifacts
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| Artifact | Expected | Status | Details |
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|----------|----------|--------|---------|
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| `jam-ui/src/components/client/JKSessionScreen.js` | handleBackingTrackSelected using openBackingTrack action | VERIFIED | Line 1144: `await openBackingTrack(result.file);` - uses action from useMediaActions (imported line 18, destructured line 153) |
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| `jam-ui/src/components/client/JKSessionBackingTrackPlayer.js` | Duration fetch useEffect with cleanup | VERIFIED | Lines 90-158: useEffect with `let ignore = false` (line 91), async checks, and cleanup `return () => { ignore = true; }` (lines 155-157) |
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### Key Link Verification
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| From | To | Via | Status | Details |
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|------|-----|-----|--------|---------|
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| JKSessionScreen.js handleBackingTrackSelected | useMediaActions openBackingTrack | async await call | VERIFIED | Line 1144: `await openBackingTrack(result.file)` - openBackingTrack destructured from useMediaActions() at line 153 |
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| JKSessionBackingTrackPlayer.js useEffect | cleanup function | return statement | VERIFIED | Lines 155-157: `return () => { ignore = true; };` |
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| openBackingTrack hook function | syncTracksToServer | dispatch call | VERIFIED | useMediaActions.js line 60: `dispatch(syncTracksToServer(sessionId, jamClient))` |
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### Requirements Coverage
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| Requirement | Status | Blocking Issue |
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|-------------|--------|----------------|
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| BT-01: Use openBackingTrack() action to enable track sync to session screen | SATISFIED | None |
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| BT-02: Add ignore flag to duration fetch useEffect | SATISFIED | None |
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### Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| JKSessionScreen.js | 1158 | TODO comment about native window | Info | Pre-existing, not related to Phase 27 changes |
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Note: JKSessionBackingTrackPlayer.js has no TODO/FIXME patterns.
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### Human Verification Required
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#### 1. Visual Verification: Backing Track in Session Screen
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**Test:** Open a backing track file in session
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**Expected:** Backing track appears in the session screen track list (not just in popup)
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**Why human:** Requires running app with native client to verify visual rendering
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#### 2. Console Warning Check
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**Test:** Open backing track popup, then close it immediately (within 1-2 seconds)
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**Expected:** No React warning "Can't perform a React state update on an unmounted component"
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**Why human:** Requires running app and monitoring browser console during rapid open/close
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### Summary
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All must-haves have been verified in the codebase:
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1. **Backing track sync:** The `handleBackingTrackSelected` function now uses `openBackingTrack(result.file)` action from useMediaActions hook. This action:
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- Calls `openBackingTrackThunk` which invokes `jamClient.SessionOpenBackingTrackFile`
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- Sets `mediaSummary.backingTrackOpen = true`
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- Calls `syncTracksToServer(sessionId, jamClient)` to sync track to session screen
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2. **Async cleanup:** The duration fetch useEffect in JKSessionBackingTrackPlayer.js implements the ignore flag pattern:
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- `let ignore = false` at useEffect start (line 91)
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- `if (ignore) return` checks before async operation (line 104) and after (line 119)
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- `if (!ignore)` guard in catch block (line 143)
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- Cleanup function `return () => { ignore = true; }` (lines 155-157)
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The direct `jamClient.SessionOpenBackingTrackFile` call has been removed from handleBackingTrackSelected (grep confirms no matches).
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---
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*Verified: 2026-02-26T11:53:24Z*
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*Verifier: Claude (gsd-verifier)*
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