docs(03-01): complete controls finalization and UAT-003 resolution plan

.planning/ROADMAP.md

@@ -42,16 +42,18 @@ Plans:
 **Plans**: 1 plan
 
 Plans:
-- [ ] 02-01: Wire slider to position state, implement drag-to-seek with SessionTrackSeekMs()
+- [x] 02-01: Wire slider to position state, implement drag-to-seek with SessionTrackSeekMs()
 
 ### Phase 3: Backing Track Finalization
 **Goal**: Complete Backing Track with error handling, edge cases, and performance optimization
 **Depends on**: Phase 2
 **Research**: Unlikely (error handling and optimization of established code)
-**Plans**: TBD
+**Plans**: 3 plans
 
 Plans:
-- [ ] TBD during phase planning
+- [x] 03-01: Finalize volume/loop controls and resolve UAT-003
+- [ ] 03-02: Add comprehensive error handling and loading states
+- [ ] 03-03: Performance optimization and final UAT
 
 ### Phase 4: JamTrack Research & Design
 **Goal**: Understand legacy JamTrack implementation (jQuery/CoffeeScript) and design React migration strategy
@@ -100,7 +102,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 |-------|----------------|--------|-----------|
 | 1. Backing Track Playback Monitoring | 1/1 | Complete | 2026-01-13 |
 | 2. Backing Track Seek Controls | 1/1 | Complete | 2026-01-14 |
-| 3. Backing Track Finalization | 0/TBD | Not started | - |
+| 3. Backing Track Finalization | 1/3 | In progress | - |
 | 4. JamTrack Research & Design | 0/TBD | Not started | - |
 | 5. JamTrack Implementation | 0/TBD | Not started | - |
 | 6. Metronome Research & Design | 0/TBD | Not started | - |

.planning/STATE.md

@@ -5,23 +5,23 @@
 See: .planning/PROJECT.md (updated 2026-01-13)
 
 **Core value:** Modernize media opening features (Backing Track, JamTrack, Metronome) from legacy jQuery/Rails to React patterns in jam-ui
-**Current focus:** Phase 2 — Backing Track Seek Controls
+**Current focus:** Phase 3 — Backing Track Finalization
 
 ## Current Position
 
-Phase: 2 of 7 (Backing Track Seek Controls)
-Plan: 1 of 1 in current phase
-Status: Phase complete (with UAT)
-Last activity: 2026-01-14 — Completed Phase 2 with UAT testing and fixes
+Phase: 3 of 7 (Backing Track Finalization)
+Plan: 1 of 3 in current phase
+Status: Plan 03-01 complete
+Last activity: 2026-01-14 — Completed Plan 03-01: Controls finalization and UAT-003 fix
 
-Progress: ████░░░░░░ 29%
+Progress: ████░░░░░░ 33%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 2
-- Average duration: 61.5 min
-- Total execution time: 2.05 hours
+- Total plans completed: 3
+- Average duration: TBD
+- Total execution time: TBD
 
 **By Phase:**
 
@@ -29,10 +29,11 @@ Progress: ████░░░░░░ 29%
 |-------|-------|-------|----------|
 | 1 | 1 | 3 min | 3 min |
 | 2 | 1 | 120 min | 120 min |
+| 3 | 1 | TBD | TBD |
 
 **Recent Trend:**
-- Last 5 plans: 3 min, 120 min
-- Trend: Phase 2 included extensive UAT testing and critical bug fixes
+- Last 5 plans: 3 min, 120 min, TBD
+- Trend: Phase 3 Plan 1 focused on controls finalization and UAT-003 fix
 
 ## Accumulated Context
 
@@ -46,15 +47,16 @@ Recent decisions affecting current work:
 - All jamClient methods in jam-ui return Promises - always use async/await pattern
 - jamClient returns string values - always parseInt() before math operations
 - End-of-track position requires SessionStopPlay() reset before new playback
-- Defer UAT-003 (seek while paused limitation) to Phase 3 - minor impact
+
+**From Phase 3 Plan 1 (03-backing-track-finalization):**
+- Volume control uses mixer system: `SessionSetTrackVolumeData(mixer.id, mixer.mode, trackVolumeObject)`
+- Loop control uses direct API: `SessionSetBackingTrackFileLoop(backingTrack.path, shouldLoop)`
+- UAT-003 resolved with state machine workaround (stores pending seek, applies on resume)
+- Remove conditional fallback code - use correct methods directly
 
 ### Deferred Issues
 
-**UAT-003: Seek while paused doesn't register** (from Phase 2)
-- Severity: Minor
-- Impact: Seeking during playback works perfectly, paused seeking requires workaround
-- Deferred to: Phase 3 (Backing Track Finalization)
-- Details: .planning/phases/02-backing-track-seek-controls/02-01-ISSUES.md
+None currently.
 
 ### Blockers/Concerns
 
@@ -63,7 +65,7 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-01-14
-Stopped at: Completed Phase 2 with UAT testing (3 blocker issues resolved, 1 minor issue deferred)
+Stopped at: Completed Phase 3 Plan 1 (controls finalization and UAT-003 fix)
 Resume file: None
 
-**Next:** Phase 3 (Backing Track Finalization) - Plan the phase or proceed with execution
+**Next:** Phase 3 Plan 2 (Error Handling & Resilience) - Ready for execution

.planning/phases/03-backing-track-finalization/03-01-SUMMARY.md

@@ -0,0 +1,60 @@
+# Phase 3 Plan 1: Controls Completion & UAT-003 Resolution Summary
+
+**Finalized volume/loop controls and resolved UAT-003 seek-while-paused limitation**
+
+## Accomplishments
+
+- Researched and implemented correct jamClient methods for volume/loop
+- Removed conditional fallback code from handlers
+- Investigated UAT-003 with multiple approaches
+- Implemented fix for seek-while-paused using state machine workaround
+
+## Files Created/Modified
+
+- `jam-ui/src/components/client/JKSessionBackingTrackPlayer.js` - Volume/loop finalization, UAT-003 fix
+
+## Commits
+
+- `7c5626ae3` - feat(03-01): finalize volume and loop controls
+- `e19051f42` - refactor(03-01): investigate UAT-003 seek while paused
+- `5797ef2fd` - feat(03-01): implement UAT-003 fix for seek while paused
+
+## Decisions Made
+
+- **Volume control**: Uses mixer system with `SessionSetTrackVolumeData(mixer.id, mixer.mode, trackVolumeObject)`
+  - Accesses backing track mixer from Redux (`selectBackingTrackMixers`)
+  - Converts 0-100% slider to dB range (-80 to +20)
+  - Updates trackVolumeObject with volL/volR
+
+- **Loop control**: Uses `SessionSetBackingTrackFileLoop(backingTrack.path, shouldLoop)`
+  - Direct API call without conditional checks
+  - Requires backing track path parameter
+
+- **UAT-003 resolution**: Implemented fix (user-approved decision)
+  - State machine workaround for jamClient limitation
+  - Stores pending seek position when paused
+  - Applies before resume with SessionStopPlay() → SessionTrackSeekMs() → SessionStartPlay()
+
+## Issues Encountered
+
+None - investigation approaches worked as expected.
+
+## UAT-003 Investigation Results
+
+**Problem confirmed**: `jamClient.SessionTrackSeekMs()` doesn't register when track is paused.
+
+**Approaches tested**:
+1. Verify position after seek - Confirmed position doesn't change when paused
+2. State machine approach - Successfully implemented workaround
+
+**Solution implemented**:
+- Added `pendingSeekPositionRef` to track seeks while paused
+- Modified `handleSeek()` to verify position after seek and store if needed
+- Modified `handlePlay()` to apply pending seek before resuming
+- Modified `handleStop()` to clear pending seeks
+
+**Result**: Seek now works consistently whether playing or paused, providing better UX.
+
+## Next Phase Readiness
+
+Ready for Plan 03-02 (Error Handling & Resilience). All controls finalized, UAT-003 resolved.