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+# Phase 19: Memory Leak Audit Report
+
+**Audit Date:** 2026-02-08
+**Auditor:** Claude Code
+**Target:** Session screen memory leak causing ~10-minute freeze
+**Methodology:** Static code analysis with line-by-line verification
+
+## Executive Summary
+
+This audit systematically examined the jam-ui session screen components, hooks, and Redux slices to identify memory leak patterns. Each file was analyzed for:
+- Timer/interval creation without cleanup
+- Event listener registration without removal
+- Unbounded state growth patterns
+- Callback registration without unregistration
+
+Findings are categorized by severity:
+- **HIGH**: Likely contributor to the 10-minute freeze
+- **MEDIUM**: May contribute to memory degradation over time
+- **LOW**: Minor or properly handled, included for completeness
+
+---
+
+## VU Meter Audit
+
+**Files Audited:**
+- `jam-ui/src/components/client/SessionTrackVU.js`
+- `jam-ui/src/hooks/useMixerStore.js`
+- `jam-ui/src/hooks/useVuHelpers.js`
+- `jam-ui/src/hooks/useMixerHelper.js`
+- `jam-ui/src/context/VuContext.js`
+- `jam-ui/src/context/MixersContext.js`
+
+**Requirements Coverage:** VUMTR-01, VUMTR-02, VUMTR-03
+
+### SessionTrackVU.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 9-30 | useEffect | Mixer registration and VU state updates | YES | LOW | Cleanup resets VU state to 0 and nulls mixerIdRef on unmount |
+
+**Analysis:** This component has proper cleanup. The useEffect at line 9 returns a cleanup function at lines 23-28 that resets the VU state.
+
+### useMixerStore.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 74-94 | useEffect | Sets `window.JK.HandleBridgeCallback2` global callback | YES | LOW | Properly deletes callback on cleanup (line 87) |
+| 55 | useRef | `recheckTimeoutRef` for timeout tracking | YES | LOW | Cleared at lines 91 and 205 |
+| 135-191 | handleBridgeCallback | VU data processing callback | N/A | MEDIUM | Callback uses ref to avoid stale closure, but could accumulate calls if not throttled |
+
+**Analysis:** The VU callback registration pattern is sound. The `window.JK.HandleBridgeCallback2` is set at line 79 and deleted at line 87 in the cleanup function. The `recheckTimeoutRef` is properly cleared on cleanup.
+
+**Potential Issue (VUMTR-01):** The `handleBridgeCallback` (lines 135-191) processes VU data but has commented-out throttling logic (lines 141-152). Without throttling, this callback may fire at very high rates (native client sends VU data frequently), potentially causing performance degradation over time.
+
+### useVuHelpers.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 6 | useState | `vuStates` object tracking VU levels per mixer | PARTIAL | HIGH | Cleared on unmount but entries never removed during session |
+| 99-104 | updateVuState | Updates vuStates object | N/A | HIGH | Adds new keys but never removes old ones |
+| 117-122 | useEffect | Cleanup effect | YES | PARTIAL | Only clears entire object on unmount, not per-mixer cleanup |
+
+**Analysis:**
+
+**VUMTR-02 - CRITICAL FINDING:** The `vuStates` object at line 6 accumulates entries over time:
+```javascript
+const [vuStates, setVuStates] = useState({});  // Line 6
+
+const updateVuState = useCallback((mixerId, level, clipping = false) => {
+  setVuStates(prev => ({
+    ...prev,
+    [mixerId]: { level, clipping }  // Adds new keys, never removes
+  }));
+}, []);  // Lines 99-104
+```
+
+When tracks are added/removed during a session, the `vuStates` object grows but entries for removed tracks are never deleted. Over a 10-minute session with multiple track changes, this could accumulate hundreds of stale entries.
+
+**Evidence:**
+- Line 100: `setVuStates(prev => ({ ...prev, [mixerId]: { level, clipping } }))` - spreads existing state and adds new entry
+- Line 120: `setVuStates({})` - only clears on full unmount
+- No mechanism to remove individual mixer entries when tracks leave
+
+### useMixerHelper.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 67 | useRef | `allMixersRef` for mixer tracking | N/A | LOW | Ref, not timer |
+| 68 | useRef | `previousMyTracksRef` for track caching | N/A | LOW | Prevents unnecessary re-renders |
+| 120 | useRef | `isReady` flag | N/A | LOW | Simple flag ref |
+
+**Analysis:** No timer/interval patterns found. Uses refs appropriately for state that shouldn't trigger re-renders.
+
+### VuContext.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 6-14 | VuProvider | Context provider using useVuHelpers | N/A | N/A | Delegates to useVuHelpers |
+
+**Analysis:** Simple context wrapper. All VU logic is in useVuHelpers.
+
+### MixersContext.js
+
+| Line | Pattern | Description | Has Cleanup | Severity | Notes |
+|------|---------|-------------|-------------|----------|-------|
+| 6-14 | MixersProvider | Context provider using useMixerHelper | N/A | N/A | Delegates to useMixerHelper |
+
+**Analysis:** Simple context wrapper. All mixer logic is in useMixerHelper.
+
+### VU Meter Findings Summary
+
+| ID | Finding | File | Lines | Severity | Fix Recommendation |
+|----|---------|------|-------|----------|-------------------|
+| VUMTR-01 | VU callback throttling disabled | useMixerStore.js | 141-152 | MEDIUM | Re-enable or implement proper throttling |
+| VUMTR-02 | vuStates object grows unbounded | useVuHelpers.js | 6, 99-104 | HIGH | Add cleanup function to remove stale mixer entries |
+| VUMTR-03 | No per-mixer cleanup on track leave | useVuHelpers.js | 117-122 | HIGH | Expose removeVuState function for track cleanup |
+
+---
+