IMPROVE: PIANO ROLL TAB khi play thì playhead luôn nằm chính giữa piano roll

app/api/v1/auth.py

@@ -259,3 +259,32 @@ async def get_profile(current_user: dict = Depends(get_current_user)):
             "max_tracks": row["max_tracks"] or 16
         }
     }
+
+
+@router.get("/first-time")
+async def auth_first_time():
+    # "Lần đăng nhập đầu" = tài khoản admin vẫn dùng mật khẩu MẶC ĐỊNH
+    # (chưa từng đổi). Sau khi đổi lần đầu → first_time = false → UI xóa
+    # gợi ý username/mật khẩu (Tùy chọn - Admin có thể bỏ trống, lần đầu:
+    # admin123, nút Điền nhanh).
+    try:
+        conn = get_db_connection()
+        try:
+            cur = conn.cursor()
+            cur.execute(
+                "SELECT id, hashed_password, must_change_password FROM users "
+                "WHERE LOWER(role) = 'admin' ORDER BY created_at ASC LIMIT 1"
+            )
+            row = cur.fetchone()
+        finally:
+            conn.close()
+        if not row:
+            return {"first_time": True}
+        still_default = False
+        try:
+            still_default = verify_password("admin123", row["hashed_password"])
+        except Exception:
+            still_default = False
+        return {"first_time": bool(row["must_change_password"]) and still_default}
+    except Exception:
+        return {"first_time": True}

app/api/v1/plugins.py

@@ -151,7 +151,11 @@ async def delete_soundfont(sf_id: str, current_user: dict = Depends(get_current_
 @router.get("/soundfonts/download/{sf_id}")
 async def download_soundfont_asset(sf_id: str):
     clean_id = sf_id.replace("sf_", "") if sf_id.startswith("sf_") else sf_id
-    for base_dir in [UPLOAD_SF_DIR, SYSTEM_SF_DIR]:
+    # Cũng tìm trong static/soundfonts (font bundled theo deployment) — trước
+    # đây chỉ UPLOAD + SYSTEM → font bundled 404 → incognito (IndexedDB rỗng)
+    # không tải được font → instrument CÂM (browser thường dùng cache nên OK).
+    static_sf_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "static", "soundfonts")
+    for base_dir in [UPLOAD_SF_DIR, SYSTEM_SF_DIR, static_sf_dir]:
         if not os.path.isdir(base_dir):
             continue
         # Prefer SF2: the client FluidSynth WASM cannot decode SF3 (Ogg Vorbis)

app/main.py

@@ -81,7 +81,12 @@ async def get_index():
     if not os.path.exists(index_path):
         return HTMLResponse(content=f"<h1>SonicForge Studio: index.html not found at {index_path}</h1>", status_code=404)
     with open(index_path, "r", encoding="utf-8") as file:
-        return HTMLResponse(content=file.read(), status_code=200)
+        resp = HTMLResponse(content=file.read(), status_code=200)
+        # no-cache: index.html PHẢI luôn mới (các bundle JS dùng ?v= để bust) —
+        # nếu browser cache HTML cũ → stamp cũ → tải bundle cũ (bug "không load
+        # được bundle mới" ở incognito — cache heuristic không có Cache-Control).
+        resp.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
+        return resp
 
 
 @app.get("/favicon.svg")

app/models/project_schema.json

@@ -45,6 +45,7 @@
         "id": { "type": "string" },
         "name": { "type": "string" },
         "type": { "type": "string", "enum": ["AUDIO", "MIDI", "SECTION"] },
+        "color": { "type": ["string", "null"], "default": null },
         "volume_db": { "type": "number", "default": 0.0 },
         "pan": { "type": "number", "minimum": -1.0, "maximum": 1.0, "default": 0.0 },
         "mute": { "type": "boolean", "default": false },

app/static/js/services/aiGateway.js

@@ -121,6 +121,57 @@ const AIGateway = (function() {
     }
   };
 
+  // ai_midi_rearrange_specification.md §3 — Function Tool Schema hỗ trợ 2 mode:
+  // SIMILAR_VARIATION (biến tấu cùng độ dài) / EXTEND_CONTINUATION (viết tiếp
+  // các bar sau). AI trả gói dữ liệu có vị trí target trên Timeline.
+  const REARRANGE_EXTEND_TOOL_SPEC = {
+    type: 'function',
+    function: {
+      name: 'rearrange_or_extend_midi_melody',
+      description: 'Analyzes source MIDI melody data and returns either a variation (Variation) or continuation (Extend) based on user instructions.',
+      parameters: {
+        type: 'object',
+        properties: {
+          mode: {
+            type: 'string',
+            enum: ['SIMILAR_VARIATION', 'EXTEND_CONTINUATION'],
+            description: "Mode: 'SIMILAR_VARIATION' (new arrangement of equal length) or 'EXTEND_CONTINUATION' (writes subsequent bars)."
+          },
+          composition_title: {
+            type: 'string',
+            description: 'Short title describing the new melody style (e.g., Jazz Swing Variation, Epic Extension Part 2)'
+          },
+          target_start_bar: {
+            type: 'number',
+            description: 'Starting bar number for the generated notes on the Timeline'
+          },
+          target_duration_bars: {
+            type: 'number',
+            description: 'Total bar duration covered by the generated sequence'
+          },
+          soundfont_id: { type: 'string', default: 'generaluser_gs' },
+          soundfont_bank: { type: 'integer', default: 0 },
+          soundfont_program: { type: 'integer', default: 0 },
+          generated_notes: {
+            type: 'array',
+            description: 'Array of AI-generated MIDI notes.',
+            items: {
+              type: 'object',
+              properties: {
+                pitch: { type: 'integer', minimum: 0, maximum: 127 },
+                start_beat: { type: 'number', description: 'Starting beat position relative to beat 0.0 of the generated item' },
+                duration_beats: { type: 'number', minimum: 0.1 },
+                velocity: { type: 'number', minimum: 0.0, maximum: 1.0 }
+              },
+              required: ['pitch', 'start_beat', 'duration_beats', 'velocity']
+            }
+          }
+        },
+        required: ['mode', 'composition_title', 'target_start_bar', 'target_duration_bars', 'generated_notes']
+      }
+    }
+  };
+
   const REARRANGE_SCENARIOS = [
     {
       id: 'arpeggio',
@@ -456,6 +507,7 @@ Ví dụ: "Hãy chọn và copy từ bar 4 đến bar 12 của track 1 sau đó
   return {
     DEFAULT_TOOLS,
     REARRANGE_TOOL_SPEC,
+    REARRANGE_EXTEND_TOOL_SPEC,
     REARRANGE_SCENARIOS,
     detectRearrangeScenario,
     buildRearrangeMessage,

app/static/js/services/soundfontPlayer.js

@@ -22,6 +22,10 @@
     let _loadedFonts = {};
     let _activeOscillators = {};
     let _gainNode = null;
+    let _pendingOutputDestination = null;
+    let _outputDestination = null; // cache đích route — dedupe swap dư giữa stream
+    let _validPercCache = {};      // { sfId: [bank, prog] | null } — preset percussion hợp lệ
+    let _sfLoadFailAt = {};        // { sfId: timestamp } — cooldown 10s sau load fail
     let _scheduledNotes = [];
     let _loadPromises = {};
     let _sfloadSeq = 0;
@@ -31,7 +35,8 @@
             if (!_gainNode) {
                 _gainNode = _audioCtx.createGain();
                 _gainNode.gain.value = 0.3;
-                _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                _gainNode.connect(_outputDestination);
             }
             return _audioCtx;
         }
@@ -40,7 +45,8 @@
             if (!_gainNode) {
                 _gainNode = ctx.createGain();
                 _gainNode.gain.value = 0.3;
-                _gainNode.connect(window.masterBus ? window.masterBus.input : ctx.destination);
+                _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : ctx.destination);
+                _gainNode.connect(_outputDestination);
             }
             return ctx;
         }
@@ -53,7 +59,8 @@
         if (!_gainNode) {
             _gainNode = window.__sharedAudioCtx.createGain();
             _gainNode.gain.value = 0.3;
-            _gainNode.connect(window.__sharedAudioCtx.destination);
+            _outputDestination = _pendingOutputDestination || window.__sharedAudioCtx.destination;
+            _gainNode.connect(_outputDestination);
         }
         return window.__sharedAudioCtx;
     };
@@ -61,6 +68,41 @@
     const SonicSF = {
         loadedFonts: _loadedFonts,
 
+        // Route the shared FluidSynth output through a per-track node (e.g. the
+        // track's gainNode) so the track's FX chain / fader / pan affect the
+        // soundfont instrument. Pass null to restore the default master-bus route.
+        setOutputDestination: function (node) {
+            try {
+                if (_gainNode) {
+                    const dest = node || (window.masterBus ? window.masterBus.input : ((_audioCtx || window.__sharedAudioCtx).destination));
+                    // DEDUPE: đích không đổi → KHÔNG disconnect/reconnect.
+                    // Swap dư giữa dòng notes đang phát (applyAllTrackMuteSolo →
+                    // updateSfRouting gọi lại cùng đích sfEntry sau noteon đầu)
+                    // làm ScriptProcessor xuất buffer uninitialized → NaN →
+                    // 11 biquad "state is bad" → CÂM (mọi log: state-bad nổ
+                    // ngay sau setOutputDestination lần 2).
+                    if (dest === _outputDestination) return;
+                    _gainNode.disconnect();
+                    _gainNode.connect(dest);
+                    // Reconnect VU analyser tap (app.jsx VU tick gắn __vuAnalyser
+                    // trên _gainNode): disconnect() không đối số ngắt MỌI kết
+                    // nối kể cả analyser → sfAudioPeak = 0 mãi → track VU MIDI
+                    // không nhảy khi có âm (user bug 06:35).
+                    if (_gainNode.__vuAnalyser) _gainNode.connect(_gainNode.__vuAnalyser);
+                    _outputDestination = dest;
+                    console.log('[SonicSF] setOutputDestination to:', node ? 'track node (sfEntry)' : 'masterBus.input');
+                } else {
+                    _pendingOutputDestination = node || null;
+                    console.log('[SonicSF] setOutputDestination pending:', node ? 'track node (sfEntry)' : 'null');
+                }
+            } catch (e) {
+                console.warn('[SonicSF] setOutputDestination error:', e);
+            }
+        },
+        getOutputNode: function () {
+            return _gainNode;
+        },
+
         init: async function (audioContext) {
             if (_initialized && _fluidModule) return;
             if (_initPromise) return _initPromise;
@@ -81,7 +123,8 @@
                     if (!_gainNode) {
                         _gainNode = _audioCtx.createGain();
                         _gainNode.gain.value = 0.3;
-                        _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                        _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                        _gainNode.connect(_outputDestination);
                     }
 
                     console.log("[SonicSF] AudioCtx state:", _audioCtx.state, "sampleRate:", _audioCtx.sampleRate);
@@ -117,7 +160,7 @@
                             // expected notice when a soundfont simply has no
                             // preset for a bank (e.g. bank 128 on a melodic-only
                             // font) — the note is just silent, not an error.
-                            if (msg && msg.indexOf('No preset found on channel') !== -1) return;
+                            if (msg && (msg.indexOf('No preset found on channel') !== -1 || msg.indexOf('There is no preset with bank number') !== -1)) return;
                             console.warn('[FluidSynth:err]', msg);
                         }
                     });
@@ -168,17 +211,31 @@
                         var spn = _audioCtx.createScriptProcessor(spBufSz, 0, 2);
                         var lp = _fluidModule._malloc(spBufSz * 4);
                         var rp = _fluidModule._malloc(spBufSz * 4);
+                        // Heap WASM có thể realloc khi load SoundFont lớn (SGM-V2.01
+                        // ~300MB) → lp/rp DANGLE → đọc vùng nhớ đã free → NaN/garbage
+                        // → master chain "state is bad" → CÂM + stuck. Theo dõi
+                        // buffer + re-malloc khi đổi.
+                        var _heapBufRef = _fluidModule.HEAPU8.buffer;
                         spn.onaudioprocess = function (e) {
                             var left = e.outputBuffer.getChannelData(0);
                             var right = e.outputBuffer.getChannelData(1);
                             var sz = left.length;
                             try {
+                                if (_fluidModule.HEAPU8.buffer !== _heapBufRef) {
+                                    try { _fluidModule._free(lp); _fluidModule._free(rp); } catch (er2) {}
+                                    lp = _fluidModule._malloc(sz * 4);
+                                    rp = _fluidModule._malloc(sz * 4);
+                                    _heapBufRef = _fluidModule.HEAPU8.buffer;
+                                }
                                 _fluidModule._fluid_synth_write_float(_synthPtr, sz, lp, 0, 1, rp, 0, 1);
                                 var hf = _fluidModule.HEAPF32;
                                 var lpb = lp >> 2, rpb = rp >> 2;
                                 for (var si = 0; si < sz; si++) {
-                                    left[si] = hf[lpb + si];
-                                    right[si] = hf[rpb + si];
+                                    // NaN sweep: mẫu NaN/Inf → 0 (chain biquad
+                                    // KHÔNG BAO GIỜ được nhận NaN → không state-bad).
+                                    var L = hf[lpb + si], R = hf[rpb + si];
+                                    left[si] = isFinite(L) ? L : 0;
+                                    right[si] = isFinite(R) ? R : 0;
                                 }
                             } catch (er) {}
                         };
@@ -249,6 +306,12 @@
 
         _doLoadSoundFont: async function (sfId) {
             try {
+                // KHÔNG unload SF cũ khi sfload SF mới: unload làm handle cũ
+                // thành rác trong khi channel state vẫn trỏ tới → program_select
+                // bị skip (progAlreadySet) → noteon trên handle đã unload →
+                // "Instrument not found ... substituted prog 0". Heap 256MB đủ
+                // cho vài SF (SGM + latin = 2 handle — log OK). SF cũ khi cần
+                // lại chỉ được sfload lại nếu map bị xóa (không xảy ra ở đây).
                 var cache = window.SonicSFStorage;
                 var buf = cache ? await cache.getBuffer(sfId) : null;
                 if (buf) {
@@ -269,8 +332,15 @@
                 var url = "/api/v1/plugins/soundfonts/download/" + encodeURIComponent(sfId) + "?t=" + Date.now();
                 var resp = await fetch(url);
                 if (!resp.ok) {
-                    console.warn("[SonicSF] SoundFont not found:", sfId);
-                    return false;
+                    // Fallback: font bundled theo deployment (static/soundfonts —
+                    // serve qua /soundfonts/{f} — catalog default-soundfonts).
+                    var url2 = "/soundfonts/" + encodeURIComponent(sfId.replace(/^sf_/, '')) + "?t=" + Date.now();
+                    var resp2 = await fetch(url2);
+                    if (!resp2.ok) {
+                        console.warn("[SonicSF] SoundFont not found:", sfId);
+                        return false;
+                    }
+                    resp = resp2;
                 }
                 buf = await resp.arrayBuffer();
                 if (cache) await cache.saveBuffer(sfId, buf);
@@ -429,10 +499,11 @@
         },
 
         _playNoteFluid: function (note, velocity, durationMs, startTime, program, channel, synthEngine) {
-            var midiPitch = Math.min(127, Math.max(0, parseInt(note) || 60));
-            var midiVel = Math.min(127, Math.max(1, Math.floor(
-                typeof velocity === 'number' ? (velocity > 1 ? velocity : velocity * 127) : 100
-            )));
+            var parsedPitch = parseInt(note);
+            var midiPitch = isNaN(parsedPitch) ? 60 : Math.min(127, Math.max(0, parsedPitch));
+            var rawVel = (typeof velocity === 'number' && isFinite(velocity)) ? (velocity > 1 ? velocity : velocity * 127) : 100;
+            if (isNaN(rawVel)) rawVel = 100;
+            var midiVel = Math.min(127, Math.max(1, Math.floor(rawVel)));
             var _origChannel = channel;
             var usedBank = 0, usedProg = 0;
             if (synthEngine) {
@@ -465,8 +536,10 @@
             var self = this;
             var doNote = function () {
                 try {
-                    var finalBank = usedBank;
-                    var finalProg = usedProg;
+                    var finalBank = parseInt(usedBank);
+                    if (isNaN(finalBank) || !isFinite(finalBank)) finalBank = 0;
+                    var finalProg = parseInt(usedProg);
+                    if (isNaN(finalProg) || !isFinite(finalProg)) finalProg = 0;
                     var finalSfId = synthEngine ? synthEngine.soundfont_id : undefined;
                     var cachedCh = _channels[ch];
                     // The note's own synth engine (track instrument) is
@@ -475,16 +548,32 @@
                     // re-picked instrument plays the wrong soundfont. Without an
                     // engine, fall back to the soundfont configured on the channel.
                     if (!synthEngine && cachedCh && cachedCh.sfId !== undefined) {
-                        finalBank = cachedCh.bank;
-                        finalProg = cachedCh.program;
+                        finalBank = parseInt(cachedCh.bank) || 0;
+                        finalProg = parseInt(cachedCh.program) || 0;
                         finalSfId = cachedCh.sfId;
                     }
                     // Ensure the soundfont is actually loaded before the note plays.
                     // Quick instrument pick on a track does not pre-load it, so load
                     // lazily here and retry the note once the font is ready.
                     if (finalSfId && !_sfHandleMap.has(finalSfId)) {
+                        // Cooldown lỗi: font 404 → KHÔNG spam fetch mỗi note (10s)
+                        // — note chạy thẳng fallback để CÓ ÂM.
+                        var _lastFail = _sfLoadFailAt[finalSfId] || 0;
+                        if (Date.now() - _lastFail < 10000) {
+                            try { self._playNoteFallback(note, velocity, durationMs, startTime, program, null, channel, synthEngine); } catch (e) {}
+                            return;
+                        }
+                        console.log('[SonicSF] soundfont not loaded yet, loading:', finalSfId);
                         self.loadSoundFont(finalSfId).then(function (ok) {
-                            if (ok) doNote();
+                            console.log('[SonicSF] loadSoundFont result:', ok, 'for:', finalSfId);
+                            if (ok) {
+                                doNote();
+                            } else {
+                                // Font KHÔNG tải được (404/format) → KHÔNG drop note
+                                // câm lặng ("bỏ qua WASM") — fallback oscillator.
+                                _sfLoadFailAt[finalSfId] = Date.now();
+                                try { self._playNoteFallback(note, velocity, durationMs, startTime, program, null, channel, synthEngine); } catch (e) {}
+                            }
                         });
                         return;
                     }
@@ -492,12 +581,43 @@
                     // instrument for each item regardless of processing order.
                     // Skip if the channel already has this exact instrument (avoids
                     // per-note soundfont reloads that cause audible crackle/glitches).
-                    var progAlreadySet = cachedCh && cachedCh.program === finalProg && cachedCh.bank === finalBank && cachedCh.sfId === finalSfId;
+                    // ⚠️ Chỉ skip khi handle SF vẫn CÒN HỢP LỆ trong map — nếu
+                    // không → vẫn program_select lại (tránh dùng handle đã unload).
+                    var progAlreadySet = cachedCh && cachedCh.program === finalProg && cachedCh.bank === finalBank && cachedCh.sfId === finalSfId
+                        && (finalSfId ? _sfHandleMap.has(finalSfId) : true);
                     if ((synthEngine || program !== undefined) && !progAlreadySet) {
                         var sfHandle = finalSfId ? _sfHandleMap.get(finalSfId) : undefined;
+                        console.log('[SonicSF] selectProgram for channel:', ch, 'sfHandle:', sfHandle, 'bank:', finalBank, 'prog:', finalProg);
                         if (sfHandle !== undefined) {
                             try {
-                                _fluidModule._fluid_synth_program_select(_synthPtr, ch, sfHandle, finalBank, finalProg);
+                                // Percussion (bank 128): tìm preset HỢP LỆ trong
+                                // font — quét bank 128 + bank 0 (0-127) MỘT LẦN,
+                                // cache theo sfId. Trước đây chỉ thử 4 preset cố
+                                // định → font không có → cache channel = (128,0)
+                                // INVALID → note sau skip re-select (progAlreadySet)
+                                // → noteon preset rỗng = CÂM ("1 âm đầu rồi câm").
+                                if (finalBank === 128) {
+                                    var _vKey = finalSfId || ('h' + sfHandle);
+                                    if (_validPercCache[_vKey] === undefined) {
+                                        var _found = null;
+                                        for (var _b = 0; _b < 2 && !_found; _b++) {
+                                            var _bk = _b === 0 ? 128 : 0;
+                                            for (var _p = 0; _p < 128 && !_found; _p++) {
+                                                try {
+                                                    if (_fluidModule._fluid_synth_program_select(_synthPtr, 9, sfHandle, _bk, _p) === 0) {
+                                                        _found = [_bk, _p];
+                                                    }
+                                                } catch (e) {}
+                                            }
+                                        }
+                                        _validPercCache[_vKey] = _found;
+                                    }
+                                    if (_validPercCache[_vKey]) {
+                                        finalBank = _validPercCache[_vKey][0];
+                                        finalProg = _validPercCache[_vKey][1];
+                                    }
+                                }
+                                var _selRet = _fluidModule._fluid_synth_program_select(_synthPtr, ch, sfHandle, finalBank, finalProg);
                             } catch (e) {}
                         } else {
                             try { _fluidModule._fluid_synth_bank_select(_synthPtr, ch, finalBank); } catch (e) {}
@@ -508,6 +628,7 @@
                         _channels[ch].program = finalProg;
                         _channels[ch].sfId = finalSfId;
                     }
+                    console.log('[SonicSF] noteon channel:', ch, 'pitch:', midiPitch, 'vel:', midiVel, 'sfId:', finalSfId);
                     _fluidModule._fluid_synth_noteon(_synthPtr, ch, midiPitch, midiVel);
                     var noteMapKey = (_origChannel !== undefined ? _origChannel : 0) + ':' + midiPitch;
                     if (!_activeNotes[noteMapKey]) _activeNotes[noteMapKey] = [];
@@ -538,6 +659,31 @@
             }
         },
 
+        // Hủy mọi note-on được schedule (tương lai) + note-off mọi notes đang
+        // ngân — gọi khi STOP/PAUSE để hết "âm thanh bị stuck" (note-on chưa
+        // bắn vẫn bắn sau khi dừng; notes durationMs>=60000 không có note-off
+        // tự động → ngân vô hạn → VU master nhảy dù không play).
+        panic: function () {
+            _scheduledNotes.forEach(function (sn) { if (sn.on) { clearTimeout(sn.on); sn.on = null; } });
+            _scheduledNotes = [];
+            if (_initialized && _fluidModule) {
+                // noteoff TỪNG note đang ngân (binding _fluid_synth_noteoff chắc
+                // chắn tồn tại — đã dùng cho duration hết) — all_notes_off có
+                // thể không có trong WASM exports (catch nuốt → notes kẹt).
+                Object.keys(_activeNotes).forEach(function (key) {
+                    var parts = key.split(':');
+                    var pitch = parseInt(parts[1], 10);
+                    (_activeNotes[key] || []).forEach(function (ch) {
+                        try { _fluidModule._fluid_synth_noteoff(_synthPtr, ch, pitch); } catch (e) {}
+                    });
+                });
+                try {
+                    for (var c = 0; c < 16; c++) _fluidModule._fluid_synth_all_notes_off(_synthPtr, c);
+                } catch (e) {}
+            }
+            _activeNotes = {};
+        },
+
         _playNoteFallback: function (note, velocity, durationMs, startTime, program, destinationNode, channel, synthEngine) {
             var ctx = getCtx();
             var freq = 440 * Math.pow(2, (note - 69) / 12);
@@ -554,7 +700,11 @@
             var oscType = 'triangle';
             var attackTime = 0.03, decayTime = 0.1, sustainLevel = 0.5, releaseTime = 0.2, volFactor = 0.25;
             var prog = program !== undefined ? parseInt(program) : 0;
-            if (channel !== undefined && channel >= 0 && channel < 16) {
+            // CHỈ dùng cache channel khi KHÔNG có program/synthEngine được
+            // truyền — trước đây override program của track bằng cache channel
+            // (bị track khác cùng channel ghi đè → preview note vẽ mới mang
+            // nhạc cụ của track TRƯỚC).
+            if (program === undefined && channel !== undefined && channel >= 0 && channel < 16) {
                 prog = _channels[channel].program || prog;
             }
             if (prog >= 0 && prog <= 7) { oscType = 'sine'; decayTime = 0.3; sustainLevel = 0.1; releaseTime = 0.2; }
@@ -572,7 +722,8 @@
             osc.frequency.setValueAtTime(freq, 0);
             var startAt = startTime !== undefined ? startTime : ctx.currentTime;
             var durSec = durationMs / 1000;
-            var vel = typeof velocity === 'number' ? (velocity > 1 ? velocity / 127 : velocity) : 0.8;
+            var vel = (typeof velocity === 'number' && isFinite(velocity) && !isNaN(velocity)) ? (velocity > 1 ? velocity / 127 : velocity) : 0.8;
+            if (isNaN(vel)) vel = 0.8;
             var targetGain = vel * volFactor;
             noteGain.gain.setValueAtTime(0, startAt);
             noteGain.gain.linearRampToValueAtTime(targetGain, startAt + attackTime);
@@ -593,6 +744,15 @@
 
         stopAll: function () {
             if (_initialized && _fluidModule) {
+                // noteoff từng note đang ngân (binding chắc chắn tồn tại) —
+                // phòng all_notes_off không có trong WASM exports.
+                Object.keys(_activeNotes).forEach(function (key) {
+                    var parts = key.split(':');
+                    var pitch = parseInt(parts[1], 10);
+                    (_activeNotes[key] || []).forEach(function (ch) {
+                        try { _fluidModule._fluid_synth_noteoff(_synthPtr, ch, pitch); } catch (e) {}
+                    });
+                });
                 for (var ch = 0; ch < 16; ch++) {
                     try { _fluidModule._fluid_synth_all_notes_off(_synthPtr, ch); } catch (e) {}
                 }
@@ -611,6 +771,7 @@
                 } catch (e) {}
             });
             Object.keys(_activeOscillators).forEach(function (k) { delete _activeOscillators[k]; });
+            _activeNotes = {};
         },
 
         saveToIndexedDB: async function (name, arrayBuffer) {

app/static/js/services/storage.js

@@ -60,11 +60,13 @@
     }
 
     let autoSaveTimer = null;
+    let lastGetProjectStateCallback = null;
     function scheduleTempAutoSave(getProjectStateCallback) {
+        if (getProjectStateCallback) lastGetProjectStateCallback = getProjectStateCallback;
         if (autoSaveTimer) clearTimeout(autoSaveTimer);
         autoSaveTimer = setTimeout(async () => {
             try {
-                const state = getProjectStateCallback();
+                const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
                 if (!state || (!state.tracks && !state.main_session)) return;
                 const dataJson = JSON.stringify(state);
                 localStorage.setItem('sonic_temp_project', dataJson);
@@ -76,10 +78,26 @@
             }
         }, 2000);
     }
+    // Lưu NGAY (bỏ debounce 2s) — dùng cho thay đổi cần bền vững tức thì (đổi màu track)
+    async function flushTempAutoSave() {
+        if (autoSaveTimer) { clearTimeout(autoSaveTimer); autoSaveTimer = null; }
+        try {
+            const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
+            if (!state || (!state.tracks && !state.main_session)) return;
+            const dataJson = JSON.stringify(state);
+            localStorage.setItem('sonic_temp_project', dataJson);
+            if (window.SonicAPI && localStorage.getItem('sonic_token')) {
+                await window.SonicAPI.saveTempProject(dataJson).catch(() => {});
+            }
+        } catch (e) {
+            console.warn("Flush temp project warning:", e);
+        }
+    }
 
     window.SonicStorage = {
         exportProjectToSFS,
         importProjectFromSFSFile,
-        scheduleTempAutoSave
+        scheduleTempAutoSave,
+        flushTempAutoSave
     };
 })();

app/templates/index.html

@@ -14,17 +14,17 @@
     <script src="/static/js/services/fluidsynthLoader.js?v=202607271245"></script>
     <script src="/static/js/services/api.js?v=202607271016"></script>
     <script src="/static/js/services/audioEngine.js?v=202607271016"></script>
-    <script src="/static/js/services/storage.js?v=202607271016"></script>
+    <script src="/static/js/services/storage.js?v=202608038200"></script>
     <script src="/static/js/services/soundfontStorage.js?v=202607271016"></script>
-    <script src="/static/js/services/soundfontPlayer.js?v=202608031340"></script>
-    <script src="/static/js/services/aiGateway.js?v=202607271016"></script>
+    <script src="/static/js/services/soundfontPlayer.js?v=202608070635"></script>
+    <script src="/static/js/services/aiGateway.js?v=202608037200"></script>
     <script src="/static/js/services/dawCommandDispatcher.js?v=202607271016"></script>
     <script src="/static/js/services/pianoRollTabService.js?v=202607272044"></script>
     <script src="/static/js/services/ghostNoteExtractor.js?v=202607271727"></script>
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608033200" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608070950" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {