# 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.
