connect solution into app: VSTi live native (vst3 attach/vst2 bridge) with WASM autosample fallback, VST GUI window (Bug 1), native-first track instrument

app/api/v1/native.py

@@ -8,6 +8,7 @@ import os
 
 from app.core.native_audio_service import get_service
 from app.core.render_engine import _find_sf2_path
+from app.core.vst_engine import get_plugin_manager
 
 router = APIRouter()
 
@@ -47,7 +48,8 @@ class SfNoteOffRequest(BaseModel):
 
 class Vst2EnsureRequest(BaseModel):
     track_id: str
-    plugin_path: str
+    plugin_path: Optional[str] = None
+    plugin_id: Optional[str] = None  # resolve path server-side
     live: bool = True
 
 
@@ -63,6 +65,23 @@ class Vst2NoteOffRequest(BaseModel):
     channel: int = 0
     pitch: int
 
+class Vst3EnsureRequest(BaseModel):
+    track_id: str
+    plugin_path: Optional[str] = None
+    plugin_id: Optional[str] = None  # resolve path server-side
+    live: bool = True
+
+class Vst3NoteRequest(BaseModel):
+    track_id: str
+    channel: int = 0
+    pitch: int
+    velocity: int = 100
+
+class Vst3NoteOffRequest(BaseModel):
+    track_id: str
+    channel: int = 0
+    pitch: int
+
 
 class RenderNote(BaseModel):
     note: int = 60
@@ -89,6 +108,24 @@ def _svc():
     return get_service()
 
 
+def _resolve_plugin_path(plugin_id: str = None, plugin_path: str = None) -> str:
+    """Resolve plugin path server-side: uu tien plugin_path truc tiep, con
+    khong thi plugin_id = ten plugin trong registry scan (JS chi co plugin_id)."""
+    path = (plugin_path or "").strip()
+    if path:
+        return path
+    pid = (plugin_id or "").strip()
+    if pid:
+        try:
+            plugins = get_plugin_manager()._scan_plugins()
+            if pid in plugins:
+                return plugins[pid]
+        except Exception:
+            pass
+    return ""
+
+
+
 @router.get("/status")
 async def status():
     return _svc().status()
@@ -142,8 +179,12 @@ async def sf_audio_stop(req: SfNoteOffRequest):
 
 @router.post("/vst2/ensure")
 async def vst2_ensure(req: Vst2EnsureRequest):
+    path = _resolve_plugin_path(req.plugin_id, req.plugin_path)
+    if not path or not os.path.exists(path):
+        raise HTTPException(status_code=400, detail=f"khong tim thay plugin "
+                                                    f"(plugin_id={req.plugin_id!r} plugin_path={req.plugin_path!r})")
     try:
-        return _svc().ensure_vst2(req.track_id, req.plugin_path, req.live)
+        return _svc().ensure_vst2(req.track_id, path, req.live)
     except RuntimeError as e:
         raise HTTPException(status_code=400, detail=str(e))
 
@@ -163,6 +204,31 @@ async def vst2_note_off(req: Vst2NoteOffRequest):
     except RuntimeError as e:
         raise HTTPException(status_code=400, detail=str(e))
 
+@router.post("/vst3/ensure")
+async def vst3_ensure(req: Vst3EnsureRequest):
+    path = _resolve_plugin_path(req.plugin_id, req.plugin_path)
+    if not path or not os.path.exists(path):
+        raise HTTPException(status_code=400, detail=f"khong tim thay plugin "
+                                                    f"(plugin_id={req.plugin_id!r} plugin_path={req.plugin_path!r})")
+    try:
+        return _svc().ensure_vst3(req.track_id, path, req.live)
+    except RuntimeError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+@router.post("/vst3/note_on")
+async def vst3_note_on(req: Vst3NoteRequest):
+    try:
+        return _svc().vst3_note_on(req.track_id, req.channel, req.pitch, req.velocity)
+    except RuntimeError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+@router.post("/vst3/note_off")
+async def vst3_note_off(req: Vst3NoteOffRequest):
+    try:
+        return _svc().vst3_note_off(req.track_id, req.channel, req.pitch)
+    except RuntimeError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
 
 @router.post("/render")
 async def render(req: RenderRequest):

app/core/native_audio_service.py

@@ -30,8 +30,8 @@ _NATIVE_DIR = (
     or os.path.join(settings.BASE_DIR, "native_host", "build", "Release")
 )
 
-_ERR = None
-_LOCK = threading.Lock()
+_ERR = None  # khoi tao buffer sau khi dinh nghia _errbuf()
+_LOCK = threading.RLock()  # reentrant: _hidden_hwnd() goi trong ensure_*
 
 
 def native_dir() -> str:
@@ -49,6 +49,39 @@ def _errbuf():
 def _errval(buf) -> str:
     return buf.value.decode(errors="replace") if buf and buf.value else ""
 
+_ERR = _errbuf()  # module-level err buffer (dung chung, 256 bytes)
+
+
+def _hidden_hwnd():
+    """Tao 1 hidden window dung lam parent cho VST3 editor headless (live).
+    SF_VST3_Attach yeu cau parent_hwnd != NULL; window 0-size khong hien thi."""
+    import ctypes as _ct
+    from ctypes import wintypes as _wt
+    if getattr(_hidden_hwnd, "_hwnd", 0):
+        return _hidden_hwnd._hwnd
+    with _LOCK:
+        if getattr(_hidden_hwnd, "_hwnd", 0):
+            return _hidden_hwnd._hwnd
+        _u = _ct.windll.user32
+        _k = _ct.windll.kernel32
+        _u.DefWindowProcW.argtypes = [_wt.HWND, _wt.UINT, _ct.c_void_p, _ct.c_void_p]
+        _u.DefWindowProcW.restype = _ct.c_long
+        _WNDPROC = _ct.WINFUNCTYPE(_ct.c_long, _wt.HWND, _wt.UINT, _ct.c_void_p, _ct.c_void_p)  # WPARAM/LPARAM 64-bit
+        class _WC(_ct.Structure):
+            _fields_ = [("style", _ct.c_uint), ("lpfnWndProc", _WNDPROC), ("cbClsExtra", _ct.c_int),
+                        ("cbWndExtra", _ct.c_int), ("hInstance", _wt.HINSTANCE), ("hIcon", _wt.HICON),
+                        ("hCursor", _wt.HANDLE), ("hbrBackground", _wt.HBRUSH), ("lpszMenuName", _wt.LPCWSTR),
+                        ("lpszClassName", _wt.LPCWSTR)]
+        _wc = _WC()
+        _wc.lpfnWndProc = _WNDPROC(_u.DefWindowProcW)
+        _wc.lpszClassName = "SonicForgeNativeHidden"
+        _wc.hInstance = _k.GetModuleHandleW(None)
+        if _u.RegisterClassW(_ct.byref(_wc)) or _k.GetLastError() == 1410:  # 1410 = class ton tai
+            _h = _u.CreateWindowExW(0, "SonicForgeNativeHidden", "sf", 0, 0, 0, 0, 0,
+                                    None, None, _wc.hInstance, None)
+            _hidden_hwnd._hwnd = _h or 0
+        return _hidden_hwnd._hwnd
+
 
 def is_available() -> bool:
     return os.path.isfile(_dll("sf_host_bridge.dll"))
@@ -133,11 +166,21 @@ class _Vst3Ctx:
         self.handle = 0
 
     def create(self, plugin_path):
+        # Attach can plugin_name = ten class VST3 (ClassInfo::name) + parent
+        # hwnd. Ten class thuong = ten file/folder .vst3; hidden window cho
+        # live headless. Neu ten class khong khop -> rc 0 -> caller fallback.
+        base = os.path.basename(plugin_path.rstrip("\\/"))
+        if base.lower().endswith(".vst3"):
+            plugin_name = base[:-5]
+        else:
+            plugin_name = os.path.splitext(base)[0]
         w = ctypes.c_int32(0)
         h = ctypes.c_int32(0)
-        self.handle = self.dll.SF_VST3_Load(plugin_path.encode("utf-8"), 0,
-                                            ctypes.byref(w), ctypes.byref(h),
-                                            _ERR, 256)
+        self.handle = self.dll.SF_VST3_Attach(plugin_path.encode("utf-8"),
+                                              plugin_name.encode("utf-8"),
+                                              _hidden_hwnd(),
+                                              ctypes.byref(w), ctypes.byref(h),
+                                              _ERR, 256)
         return self.handle
 
     def close(self):
@@ -509,10 +552,10 @@ class NativeAudioService:
                 raise RuntimeError(f"thiếu {_dll('vst3_host_bridge.dll')}")
             dll = ctypes.WinDLL(_dll("vst3_host_bridge.dll"))
             i32 = ctypes.c_int32
-            dll.SF_VST3_Load.argtypes = [ctypes.c_char_p, ctypes.c_void_p,
-                                         ctypes.POINTER(i32), ctypes.POINTER(i32),
-                                         ctypes.c_char_p, i32]
-            dll.SF_VST3_Load.restype = i32
+            dll.SF_VST3_Attach.argtypes = [ctypes.c_char_p, ctypes.c_char_p,
+                                           ctypes.c_void_p, ctypes.POINTER(i32),
+                                           ctypes.POINTER(i32), ctypes.c_char_p, i32]
+            dll.SF_VST3_Attach.restype = i32
             dll.SF_VST3_SendNoteOn.argtypes = [i32, i32, i32, i32]
             dll.SF_VST3_SendNoteOn.restype = i32
             dll.SF_VST3_SendNoteOff.argtypes = [i32, i32, i32]
@@ -543,7 +586,7 @@ class NativeAudioService:
                 ctx = _Vst3Ctx(dll)
                 h = ctx.create(plugin_path)
                 if h <= 0:
-                    raise RuntimeError(f"SF_VST3_Load fail: {_errval(_ERR)}")
+                    raise RuntimeError(f"SF_VST3_Attach fail: {_errval(_ERR)}")
                 ctx.SetMasterGain(h, self._master_lin)
                 if live:
                     rc = ctx.AudioStart(h, self.sample_rate, self.block_size, _ERR, 256)

app/main.py

@@ -134,6 +134,15 @@ async def get_index():
         return resp
 
 
+
+@app.get("/vst_gui.html", response_class=HTMLResponse)
+async def get_vst_gui():
+    """Cửa sổ VST GUI (Bug 1): Rust mở WebviewUrl::App("vst_gui.html?...") —
+    trong devUrl (localhost:8000) cần route riêng vì file nằm /static/vst_gui.html."""
+    vst_gui_path = os.path.join(STATIC_DIR, "vst_gui.html")
+    if os.path.exists(vst_gui_path):
+        return FileResponse(vst_gui_path, media_type="text/html")
+    return HTMLResponse(content="<h1>vst_gui.html not found</h1>", status_code=404)
 @app.get("/favicon.svg")
 async def get_favicon():
     favicon_path = os.path.join(settings.TEMPLATES_DIR, "favicon.svg")

app/static/js/app.jsx

@@ -68,6 +68,25 @@ const resolveTrackInstrumentCtx = (track, tracks) => {
   return { ch, program: undefined, synthEngine: undefined, sfId: undefined, bank: 0, prog: 0 };
 };
 
+// Sub-tab (piano roll / section) instrument override: uu tien instrument cua
+// CHINH TAB (st.instrumentProgram / st.instrumentId sf_*) — section scope va
+// tab co the load instrument rieng khac main track. Khong co -> fallback track.
+const resolveSubTabInstrumentCtx = (st, fallbackTrack, tracks) => {
+  const all = tracks || [];
+  const ch = fallbackTrack ? assignTrackMidiChannel(fallbackTrack, all) : 0;
+  const stInstId = st && st.instrumentId;
+  if (st && stInstId && typeof stInstId === 'string' && stInstId.startsWith('sf_')) {
+    const sfId = stInstId.replace('sf_', '');
+    const sfProg = (st.instrumentProgram !== undefined && st.instrumentProgram !== null) ? st.instrumentProgram : 0;
+    const se = { type: 'soundfont', plugin_id: stInstId, soundfont_bank: 0, soundfont_program: sfProg, soundfont_id: sfId };
+    return { ch, program: undefined, synthEngine: se, sfId, bank: 0, prog: sfProg };
+  }
+  if (st && st.instrumentProgram !== undefined && st.instrumentProgram !== null) {
+    return { ch, program: st.instrumentProgram, synthEngine: undefined, sfId: undefined, bank: 0, prog: st.instrumentProgram };
+  }
+  return resolveTrackInstrumentCtx(fallbackTrack, all);
+};
+
 // Đảm bảo FluidSynth channel của track đã select ĐÚNG instrument trước khi
 // notes bắn. Fire-and-forget: playNote tự load + retry nếu SF chưa load xong
 // (dedup sẵn trong loadSoundFont) — không chặn, không gây stall khi mở tab.
@@ -126,6 +145,25 @@ const scheduleCarlaNote = (synthEngine, channel, pitch, velocity, startWallTime,
   } catch (e) { console.warn('[Carla] scheduleCarlaNote error:', e); }
 };
 
+// ── Native VST GUI (Bug 1) ──────────────────────────────────────────────
+// Standalone (Tauri): mo cua so native editor qua command Rust open_vst_gui
+// (VST3 .vst3 / VST2 .dll attach HWND, khong spawn Carla ngoai app).
+// Browser: fallback ve Carla bridge cu.
+const kindFromPath = (p) => (p || '').toLowerCase().endsWith('.vst3') ? 'vst3' : 'vst2';
+const canOpenNativeVstGui = () => !!(window.__TAURI__ && window.__TAURI__.core) || !!(window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local);
+const openNativeVstGui = (pluginId, trackId, pluginPath, pluginKind) => {
+  try {
+    if (window.__TAURI__ && window.__TAURI__.core) {
+      return window.__TAURI__.core.invoke('open_vst_gui', {
+        pluginId: pluginId || '',
+        trackId: trackId || '',
+        pluginPath: pluginPath || '',
+        pluginKind: pluginKind || kindFromPath(pluginPath),
+      });
+    }
+  } catch (e) { console.warn('[VstGui] invoke error, fallback Carla:', e); }
+  return window.SonicAPI && window.SonicAPI.openInCarla ? window.SonicAPI.openInCarla(pluginId, pluginPath) : Promise.resolve({ success: false });
+};
 // ── Carla bridge alive tracking + auto-open ────────────────────────────────
 // window.__carlaRunning: undefined = chưa biết | true = đang chạy | false = đã chết.
 // window.__carlaNoteQueue: nốt chờ flush khi Carla chưa ready (cold start).
@@ -277,7 +315,11 @@ const _routePreviewNote = (trackId, ctx, pitch, velocity, durationMs, sourceType
 };
 const _stopMidiFilePreview = () => {
   if (_midiFilePreviewAudio) {
-    try { _midiFilePreviewAudio.pause(); _midiFilePreviewAudio.currentTime = 0; } catch (e) {}
+    try {
+      // AudioBufferSourceNode chi co stop(); HTMLAudioElement chi co pause().
+      if (_midiFilePreviewAudio.stop) { _midiFilePreviewAudio.stop(); }
+      else { _midiFilePreviewAudio.pause(); _midiFilePreviewAudio.currentTime = 0; }
+    } catch (e) {}
     _midiFilePreviewAudio = null;
   }
 };
@@ -5945,7 +5987,7 @@ const PluginManagerModal = ({ isOpen, onClose, pluginsData, onInsertInstrument }
                   ),
                   React.createElement('div', { className: 'flex items-center gap-2' },
                     (window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local) && React.createElement('button', {
-                      onClick: (e) => { e.stopPropagation(); window.SonicAPI.openInCarla(v.id).then(function (r) { if (r && r.success) showToast('Đã mở Carla với ' + (v.name || v.id), 'success'); }).catch(function (err) { showToast('Lỗi mở Carla: ' + (err.message || err), 'error'); }); },
+                      onClick: (e) => { e.stopPropagation(); openNativeVstGui(v.id, selectedTrackId, v.path, v.type).then(function (r) { if (r && (r.success || typeof r === 'string')) showToast('Đã mở GUI với ' + (v.name || v.id), 'success'); }).catch(function (err) { showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'); }); },
                       className: 'text-[10px] bg-teal-800 hover:bg-teal-700 text-white px-2 py-1 rounded transition shrink-0',
                       title: 'Mở trong Carla (native GUI)'
                     }, '🎛 Carla'),
@@ -6102,7 +6144,7 @@ const PluginManagerModal = ({ isOpen, onClose, pluginsData, onInsertInstrument }
                     React.createElement('span', { className: 'truncate' }, v.name),
                     React.createElement('span', { className: 'text-[9px] text-zinc-600 font-mono truncate ml-auto' }, v.dir),
                     (window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local) && React.createElement('button', {
-                      onClick: () => { window.SonicAPI.openInCarla(null, v.path).then(function (r) { if (r && r.success) showToast('Đã mở Carla với ' + v.name, 'success'); }).catch(function (err) { showToast('Lỗi mở Carla: ' + (err.message || err), 'error'); }); },
+                      onClick: () => { openNativeVstGui(v.name || v.id, selectedTrackId, v.path, v.type).then(function (r) { if (r && (r.success || typeof r === 'string')) showToast('Đã mở GUI với ' + v.name, 'success'); }).catch(function (err) { showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'); }); },
                       className: 'text-[9px] bg-teal-800 hover:bg-teal-700 text-white px-1.5 py-0.5 rounded transition shrink-0',
                       title: 'Mở trong Carla (native GUI)'
                     }, '🎛')
@@ -8287,7 +8329,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
             currentBeat < n.start_beat && newBeat >= n.start_beat
           );
           var pvTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-          var pvCtx = resolveTrackInstrumentCtx(pvTrk, activeTracks);
+          var pvCtx = resolveSubTabInstrumentCtx(st, pvTrk, activeTracks);
           ensureSonicInstrument(pvCtx);
           playing.forEach(n => {
             if (isStandaloneSf() && isSfTrackEngine(pvCtx.synthEngine) && !shouldRouteCarla(pvCtx.synthEngine)) {
@@ -8660,7 +8702,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
       if (window.SonicSF) {
         const ctx = getAudioContext();
         var clTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-        var clCtx = resolveTrackInstrumentCtx(clTrk, activeTracks);
+        var clCtx = resolveSubTabInstrumentCtx(st, clTrk, activeTracks);
         ensureSonicInstrument(clCtx);
         if (isStandaloneSf() && isSfTrackEngine(clCtx.synthEngine) && !shouldRouteCarla(clCtx.synthEngine)) {
           if (!_routePreviewNote(clTrk && clTrk.id, clCtx, notes[clickedNoteIdx].pitch, notes[clickedNoteIdx].velocity || 0.8, 300, 'CLICK')) {
@@ -8925,15 +8967,15 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         previewNodesRef.current = null;
       }
       var dwTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-      var dwCtx = resolveTrackInstrumentCtx(dwTrk, activeTracks);
+      var dwCtx = resolveSubTabInstrumentCtx(st, dwTrk, activeTracks);
       var dwCh = dwTrk ? assignTrackMidiChannel(dwTrk, activeTracks) : 0;
       var dwPitch = snapToScaleRef.current ? snapPitchToScale(pitch, selectedScaleRef.current) : pitch;
       var dwDurMs = Math.max(100, Math.round(initialDur * (60 / bpm) * 1000));
-      if (isStandaloneSf() && isSfTrackEngine(dwTrk && dwTrk.synth_engine) && !shouldRouteCarla(dwTrk && dwTrk.synth_engine)) {
+      if (isStandaloneSf() && isSfTrackEngine(dwCtx.synthEngine) && !shouldRouteCarla(dwCtx.synthEngine)) {
         if (!_routePreviewNote(dwTrk && dwTrk.id, dwCtx, dwPitch, brushVelocityRef.current || 0.8, dwDurMs, 'DRAW')) {
           if (window.SonicSF && window.SonicSF.playNote) {
             const ctx = getAudioContext();
-            window.SonicSF.playNote(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwTrk ? dwTrk.instrumentProgram : undefined, null, dwCh, dwTrk ? dwTrk.synth_engine : undefined);
+            window.SonicSF.playNote(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwCtx.program, null, dwCh, dwCtx.synthEngine);
           }
         }
       } else if (window.SonicSF && window.SonicSF.playNote) {
@@ -8941,7 +8983,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         // playNote (FluidSynth — nhạc cụ THẬT của track). _playNoteFallback chỉ
         // là oscillator beep (sai âm với percussion/soundfont — user: note vẽ
         // mới nghe nhạc cụ track trước).
-        window.SonicSF.playNote(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwTrk ? dwTrk.instrumentProgram : undefined, null, dwCh, dwTrk ? dwTrk.synth_engine : undefined);
+        window.SonicSF.playNote(dwPitch, Math.round(brushVelocityRef.current * 127), dwDurMs, ctx.currentTime, dwCtx.program, null, dwCh, dwCtx.synthEngine);
       }
     }
   };
@@ -9034,7 +9076,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
         // mastering FX của main out khi chain bật)
         try { if (window.__ensureMasteringRouting) window.__ensureMasteringRouting(); } catch (er) {}
         var pvTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-        var pvCtxInst = resolveTrackInstrumentCtx(pvTrk, activeTracks);
+        var pvCtxInst = resolveSubTabInstrumentCtx(st, pvTrk, activeTracks);
         if (isStandaloneSf() && isSfTrackEngine(pvCtxInst.synthEngine) && !shouldRouteCarla(pvCtxInst.synthEngine)) {
           if (!_routePreviewNote(pvTrk && pvTrk.id, pvCtxInst, p, brushVelocityRef.current || 0.8, durMs, 'DRAW')) {
             if (window.SonicSF && window.SonicSF.playNote) {
@@ -9409,7 +9451,7 @@ const PianoRollTabEditor = ({ st, zoom, bpm, viewportWidth, activeTracks, onClos
 
   const renderKeybed = () => {
     var kbTrk = activeTracks.find(function(t) { return t.id === st.trackId; });
-    var kbCtx = resolveTrackInstrumentCtx(kbTrk, activeTracks);
+    var kbCtx = resolveSubTabInstrumentCtx(st, kbTrk, activeTracks);
     ensureSonicInstrument(kbCtx);
     const keys = [];
     for (let pitch = 127; pitch >= PITCH_START; pitch--) {
@@ -11823,10 +11865,10 @@ const FXRackModal = ({ track, onUpdateTrack, onClose }) => {
                   <button
                     onClick={() => {
                       if (!ap.plugin) { window.showToast && window.showToast('Chọn VST FX trước khi Load Carla', 'warning'); return; }
-                      window.SonicAPI.openInCarla(ap.plugin, ap.plugin_path).then(r => {
-                        if (r && r.success) { window.showToast && window.showToast('Đã mở Carla với ' + ap.plugin + ' (VST FX) — chỉnh âm thanh trong Carla', 'success'); }
-                        else { window.showToast && window.showToast('Không mở được Carla', 'error'); }
-                      }).catch(err => window.showToast && window.showToast('Lỗi mở Carla: ' + (err.message || err), 'error'));
+                      openNativeVstGui(ap.plugin, track.id, ap.plugin_path, kindFromPath(ap.plugin_path)).then(r => {
+                        if (r && (r.success || typeof r === 'string')) { window.showToast && window.showToast('Đã mở GUI với ' + ap.plugin + ' (VST FX) — chỉnh âm thanh trong cửa sổ', 'success'); }
+                        else { window.showToast && window.showToast('Không mở được VST GUI', 'error'); }
+                      }).catch(err => window.showToast && window.showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'));
                     }}
                     className="px-4 py-1.5 bg-teal-700 hover:bg-teal-600 text-white text-xs font-semibold rounded transition flex items-center gap-1 shrink-0"
                   >
@@ -12952,12 +12994,12 @@ const MasteringModal = ({ isOpen, onClose, masteringSettings, setMasteringSettin
                       onClick={() => {
                         const plugin = (ozState.carlaBridge && ozState.carlaBridge.plugin) || '';
                         if (!plugin) { window.showToast && window.showToast('Chọn VST FX trước khi Load Carla', 'warning'); return; }
-                        window.SonicAPI.openInCarla(plugin, ozState.carlaBridge.plugin_path).then(r => {
-                          if (r && r.success) {
+                        openNativeVstGui(plugin, '', ozState.carlaBridge.plugin_path, kindFromPath(ozState.carlaBridge.plugin_path)).then(r => {
+                          if (r && (r.success || typeof r === 'string')) {
                             setOzState(prev => ({ ...prev, carlaBridge: { ...(prev.carlaBridge || {}), connected: true } }));
-                            window.showToast && window.showToast('Đã mở Carla với ' + plugin + ' (VST FX) — chỉnh âm thanh trong Carla', 'success');
-                          } else { window.showToast && window.showToast('Không mở được Carla', 'error'); }
-                        }).catch(err => window.showToast && window.showToast('Lỗi mở Carla: ' + (err.message || err), 'error'));
+                            window.showToast && window.showToast('Đã mở GUI với ' + plugin + ' (VST FX) — chỉnh âm thanh trong cửa sổ', 'success');
+                          } else { window.showToast && window.showToast('Không mở được VST GUI', 'error'); }
+                        }).catch(err => window.showToast && window.showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'));
                       }}
                       className="px-4 py-1.5 bg-teal-700 hover:bg-teal-600 text-white text-xs font-semibold rounded transition flex items-center gap-1 shrink-0"
                     >
@@ -14281,14 +14323,34 @@ const MediaExplorerPanel = ({ height, clipboardRef, active }) => {
             };
           });
         if (nativeNotes.length) {
-          window.SonicAPI.soundfontRender({ soundfont_id: sfId, bank: bank, program: prog !== undefined ? prog : 0, bpm: bpmVal, notes: nativeNotes }).then(function (res) {
+          window.SonicAPI.soundfontRender({ soundfont_id: sfId, bank: bank, program: prog !== undefined ? prog : 0, bpm: bpmVal, notes: nativeNotes }).then(async function (res) {
             if (!res || !res.success || !res.url) return;
             if (selectTokenRef.current !== (token || selectTokenRef.current)) return;
-            const audio = new Audio(API_BASE_URL + res.url);
-            audio.loop = !!isLoopingRef.current;
-            if (_midiFilePreviewAudio) { try { _midiFilePreviewAudio.pause(); } catch (e) {} }
-            _midiFilePreviewAudio = audio;
-            audio.play().catch(function () {});
+            // Preview qua masterBus (mastering FX main out khi chain bat; nguoc
+            // lai qua dryInput) — truoc day new Audio() ra thang loa.
+            try {
+              const resp = await fetch(API_BASE_URL + res.url);
+              const arrBuf = await resp.arrayBuffer();
+              const ctx2 = getAudioContext();
+              const decoded = await ctx2.decodeAudioData(arrBuf);
+              if (selectTokenRef.current !== (token || selectTokenRef.current)) return;
+              const src = ctx2.createBufferSource();
+              src.buffer = decoded;
+              src.loop = !!isLoopingRef.current;
+              const g = ctx2.createGain();
+              src.connect(g);
+              const mb = window.masterBus;
+              if (mb && mb.input && mb.dryInput) {
+                g.connect(masteringChainOn() ? mb.input : mb.dryInput);
+              } else {
+                g.connect(ctx2.destination);
+              }
+              if (_midiFilePreviewAudio) {
+                try { if (_midiFilePreviewAudio.stop) _midiFilePreviewAudio.stop(); else _midiFilePreviewAudio.pause(); } catch (e) {}
+              }
+              _midiFilePreviewAudio = src;
+              src.start();
+            } catch (e) { console.error('MIDI preview audio failed', e); }
           });
         }
         const startedAtTime = startWallTime - loopStartSec;
@@ -22202,7 +22264,7 @@ const App = () => {
     // phải chơi ĐÚNG instrument đó. ensureSonicInstrument select channel đúng
     // trước khi notes bắn (fire-and-forget — playNote tự load+retry nếu SF
     // chưa xong).
-    const instCtx = resolveTrackInstrumentCtx(track, activeTracksRef.current || []);
+    const instCtx = resolveSubTabInstrumentCtx(st, track, activeTracksRef.current || []);
     const instrumentProgram = instCtx.program;
     const synthEngine = instCtx.synthEngine;
     const mainCh = instCtx.ch;
@@ -22215,7 +22277,10 @@ const App = () => {
     // the item window, so no absolute-session offset is applied anywhere here.
     const routeCarla = shouldRouteCarla(synthEngine);
     if (isStandaloneSf() && !routeCarla && isSfTrackEngine(synthEngine)) {
-      scheduleNativeSfItem(track, { startTime: 0, notes: midiNotes }, offsetSeconds, context, destNode, bpm, { sources: activeSourcesRef.current, isActive: () => !!isPlayingRef.current });
+      // synthEngine co the la instrument cua CHINH TAB (resolveSubTabInstrumentCtx)
+      // — pseudo-track de scheduleNativeSfItem render dung SF cua tab.
+      const nativeTrack = synthEngine ? Object.assign({}, track, { synth_engine: synthEngine }) : track;
+      scheduleNativeSfItem(nativeTrack, { startTime: 0, notes: midiNotes }, offsetSeconds, context, destNode, bpm, { sources: activeSourcesRef.current, isActive: () => !!isPlayingRef.current });
       return; // native render cả tab → audio buffer (không per-note WASM/Carla)
     }
     midiNotes.forEach(note => {
@@ -24476,7 +24541,9 @@ const App = () => {
       }
     } catch (e) {
       showToast('Không thể nạp file từ Media Explorer: ' + e.message, 'error');
+      return null;
     }
+    showToast('Không thể nạp file từ Media Explorer: thiếu dữ liệu file.', 'error');
     return null;
   };
 
@@ -29798,7 +29865,14 @@ STRICT CONSTRAINTS:
           }
           return;
         }
-        const f = e.dataTransfer.files && e.dataTransfer.files[0];
+        const dt = e.dataTransfer;
+        let f = dt && dt.files && dt.files[0];
+        if (!f && dt && dt.items) {
+          for (let i = 0; i < dt.items.length; i++) {
+            const it = dt.items[i];
+            if (it.kind === 'file' && typeof it.getAsFile === 'function') { f = it.getAsFile(); if (f) break; }
+          }
+        }
         if (!f) return;
         if (/\.mid$|\.midi$/i.test(f.name || '')) {
           handleDropMidiToNewTracks(f);
@@ -29838,7 +29912,14 @@ STRICT CONSTRAINTS:
             if (f) loadFileOnTrack(track.id, f);
             return;
           }
-          const f = e.dataTransfer.files && e.dataTransfer.files[0];
+          const dt = e.dataTransfer;
+          let f = dt && dt.files && dt.files[0];
+          if (!f && dt && dt.items) {
+            for (let i = 0; i < dt.items.length; i++) {
+              const it = dt.items[i];
+              if (it.kind === 'file' && typeof it.getAsFile === 'function') { f = it.getAsFile(); if (f) break; }
+            }
+          }
           if (!f) return;
           loadFileOnTrack(track.id, f);
         },
@@ -31295,10 +31376,10 @@ STRICT CONSTRAINTS:
               closeInstrumentSelector();
               // TỰ ĐỘNG mở Carla với VSTi vừa chọn (desktop + Carla local) —
               // Carla load sẵn plugin + keyboard ảo để preview realtime.
-              if (window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local) {
-                window.SonicAPI.openInCarla(v.id).then(function (r) {
-                  if (r && r.success) showToast('Đã mở Carla với ' + (v.name || v.id) + ' — chọn preset, bấm keyboard để preview', 'success');
-                }).catch(function (err) { showToast('Lỗi mở Carla: ' + (err.message || err), 'error'); });
+              if (canOpenNativeVstGui()) {
+                openNativeVstGui(v.id, instrumentSelectorTrackId, v.path, v.type).then(function (r) {
+                  if (r && (r.success || typeof r === 'string')) showToast('Đã mở GUI với ' + (v.name || v.id) + ' — chỉnh tham số, bấm keyboard để preview', 'success');
+                }).catch(function (err) { showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'); });
               }
             },
             className: "w-full text-left px-3 py-2 text-sm rounded bg-zinc-800 hover:bg-violet-800 text-zinc-300 flex items-center justify-between gap-2"
@@ -31386,18 +31467,17 @@ STRICT CONSTRAINTS:
           setInstrumentDropdownTrackId(null);
           setInstrumentDropdownBtnRect(null);
           setTrackInstrumentWithUndo(instrumentDropdownTrackId, v.id, v.name || v.id);
-          // TỰ ĐỘNG mở Carla với VSTi vừa chọn (desktop + Carla local) —
-          // Carla load sẵn plugin, native GUI + keyboard ảo để preview realtime.
-          if (window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local) {
-            window.SonicAPI.openInCarla(v.id).then(function (r) {
-              if (r && r.success) showToast('Đã mở Carla với ' + (v.name || v.id) + ' — chọn preset, bấm keyboard để preview', 'success');
-            }).catch(function (err) { showToast('Lỗi mở Carla: ' + (err.message || err), 'error'); });
+          // TỰ ĐỘNG mở native GUI với VSTi vừa chọn (standalone) / Carla (browser).
+          if (canOpenNativeVstGui()) {
+            openNativeVstGui(v.id, instrumentDropdownTrackId, v.path, v.type).then(function (r) {
+              if (r && (r.success || typeof r === 'string')) showToast('Đã mở GUI với ' + (v.name || v.id) + ' — chọn preset, bấm keyboard để preview', 'success');
+            }).catch(function (err) { showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'); });
           }
         },
         className: "flex-1 min-w-0 text-left px-3 py-1.5 text-xs bg-zinc-800 hover:bg-violet-800 text-zinc-200 flex items-center justify-between"
       }, /*#__PURE__*/React.createElement("span", { className: "truncate" }, v.name || v.id), /*#__PURE__*/React.createElement("span", { className: "text-[10px] text-cyan-400 shrink-0 ml-1" }, v.type || "VST")),
       window.SonicRuntime && window.SonicRuntime.capabilities && window.SonicRuntime.capabilities.features && window.SonicRuntime.capabilities.features.carla_local ? /*#__PURE__*/React.createElement("button", {
-        onClick: (e) => { e.stopPropagation(); window.SonicAPI.openInCarla(v.id).then(function (r) { if (r && r.success) { showToast('Đã mở Carla: ' + (v.name || v.id), 'success'); } }).catch(function (err) { showToast('Lỗi mở Carla: ' + (err.message || err), 'error'); }); },
+        onClick: (e) => { e.stopPropagation(); openNativeVstGui(v.id, instrumentDropdownTrackId, v.path, v.type).then(function (r) { if (r && (r.success || typeof r === 'string')) { showToast('Đã mở GUI: ' + (v.name || v.id), 'success'); } }).catch(function (err) { showToast('Lỗi mở VST GUI: ' + (err.message || err), 'error'); }); },
         className: "shrink-0 px-2 text-xs bg-zinc-800 hover:bg-teal-700 text-teal-300 border-l border-zinc-700",
         title: "Mở trong Carla (native GUI)"
       }, "\uD83C\uDF9B") : null

app/static/js/services/nativeAudioClient.js

@@ -58,16 +58,30 @@ window.SonicNativeAudio = window.SonicNativeAudio || {};
                 console.warn('[NativeAudio] sf/ensure:', e.message);
             });
         },
+        ensureVst2: function (trackId, pluginId, pluginPath) {
+            return post('/vst2/ensure', { track_id: trackId, plugin_id: pluginId || null, plugin_path: pluginPath || null, live: true }).catch(function (e) {
+                console.warn('[NativeAudio] vst2/ensure:', e.message);
+            });
+        },
+        ensureVst3: function (trackId, pluginId, pluginPath) {
+            return post('/vst3/ensure', { track_id: trackId, plugin_id: pluginId || null, plugin_path: pluginPath || null, live: true }).catch(function (e) {
+                console.warn('[NativeAudio] vst3/ensure:', e.message);
+            });
+        },
         noteOn: function (kind, trackId, channel, pitch, velocity) {
-            var path = kind === 'vst2' ? '/vst2/note_on' : '/sf/note_on';
+            var path = kind === 'vst2' ? '/vst2/note_on' : (kind === 'vst3' ? '/vst3/note_on' : '/sf/note_on');
+            // Rethrow sau warn: TrackInstrument can fallback autosample/WASM
+            // khi native khong san sang (DLL/plugin loi).
             return post(path, { track_id: trackId, channel: channel || 0, pitch: pitch, velocity: velocity != null ? velocity : 100 }).catch(function (e) {
                 console.warn('[NativeAudio] note_on:', e.message);
+                throw e;
             });
         },
         noteOff: function (kind, trackId, channel, pitch) {
-            var path = kind === 'vst2' ? '/vst2/note_off' : '/sf/note_off';
+            var path = kind === 'vst2' ? '/vst2/note_off' : (kind === 'vst3' ? '/vst3/note_off' : '/sf/note_off');
             return post(path, { track_id: trackId, channel: channel || 0, pitch: pitch }).catch(function (e) {
                 console.warn('[NativeAudio] note_off:', e.message);
+                throw e;
             });
         },
         sfAudioStop: function (trackId) {

app/static/js/services/trackInstrument.js

@@ -20,9 +20,23 @@ window.TrackInstrument = window.TrackInstrument || {};
         this.dest = ctx ? (ctx.dest || null) : null;
     }
 
-    // Native engine sẵn sàng cho track SF? (chỉ khi có sfId — đường native)
+    // Loại engine native cho track: 'sf' (soundfont), 'vst3'/'vst2' (VSTi có
+    // plugin_id) hay null (không native được → fallback WASM/autosample).
+    TrackInstrument.prototype._nativeKind = function () {
+        try {
+            if (this.sfId) return 'sf';
+            if (window.SonicNativeAudio && this.synthEngine && this.synthEngine.plugin_id) {
+                var t = String(this.synthEngine.type || '');
+                if (t.indexOf('vst2') !== -1) return 'vst2';
+                if (t.indexOf('vst3') !== -1 || t.indexOf('vst') !== -1) return 'vst3';
+            }
+        } catch (e) { }
+        return null;
+    };
+
+    // Native engine sẵn sàng cho track? (sfId cho SF, plugin_id cho VSTi)
     TrackInstrument.prototype._nativeReady = function () {
-        try { return !!(window.SonicNativeAudio && this.sfId); } catch (e) { return false; }
+        return this._nativeKind() !== null;
     };
 
     // Đảm bảo channel đã select đúng instrument trước khi play (fire-and-forget:
@@ -40,17 +54,48 @@ window.TrackInstrument = window.TrackInstrument || {};
         }
     };
 
+    // Phát qua SonicSF WASM (fallback khi native fail). SonicSF tự autosample
+    // VSTi (soundfontPlayer._playNoteFluid) nên không cần ensure riêng ở đây.
+    TrackInstrument.prototype._fallbackPlayNote = function (pitch, velocity, durationMs, startTime) {
+        try {
+            if (!window.SonicSF || !window.SonicSF.playNote) return;
+            this._ensure();
+            var durF = (durationMs != null ? durationMs : 500) || 500;
+            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, durF, startTime, this.program, this.dest, this.ch, this.synthEngine);
+        } catch (e) {
+            console.warn('[TrackInstrument] fallback playNote error:', e);
+        }
+    };
+
     // velocity: router đã normalize int 1-127 (unifiedMidiRouter.normalizeVelocity).
     TrackInstrument.prototype.playNote = function (pitch, velocity, durationMs, startTime) {
         var vel = velocity != null ? velocity : 100;
-        if (this._nativeReady()) {
+        var kind = this._nativeKind();
+        if (kind) {
             try {
                 var self = this;
                 var dur = (durationMs != null ? durationMs : 500) || 500;
-                // ensure native SF engine cho track (server dedup theo track_id)
-                window.SonicNativeAudio.ensureSf(this.trackId, this.sfId, this.bank, this.prog)
-                    .catch(function () {});
-                window.SonicNativeAudio.noteOn('sf', this.trackId, this.ch, pitch, vel);
+                if (kind === 'sf') {
+                    // ensure native SF engine cho track (server dedup theo track_id)
+                    window.SonicNativeAudio.ensureSf(this.trackId, this.sfId, this.bank, this.prog)
+                        .catch(function () {});
+                } else {
+                    // VSTi live native (Phase 2): ensure + note-on qua bridge DLL.
+                    // Server resolve plugin_id -> path; lỗi -> fallback WASM autosample.
+                    if (kind === 'vst3') {
+                        window.SonicNativeAudio.ensureVst3(this.trackId, this.synthEngine.plugin_id, this.synthEngine.plugin_path)
+                            .catch(function () {});
+                    } else {
+                        window.SonicNativeAudio.ensureVst2(this.trackId, this.synthEngine.plugin_id, this.synthEngine.plugin_path)
+                            .catch(function () {});
+                    }
+                }
+                window.SonicNativeAudio.noteOn(kind, this.trackId, this.ch, pitch, vel).catch(function (err) {
+                    // Native khong phat duoc (DLL/plugin loi) -> fallback WASM:
+                    // SF track di SonicSF, VSTi di autosample (SonicSF tu ensure).
+                    console.warn('[TrackInstrument] native noteOn fail -> WASM fallback:', err && err.message);
+                    self._fallbackPlayNote(pitch, velocity, dur, startTime);
+                });
                 // ponytail: TrackInstrument không biết audioCtx → bỏ startTime
                 // offset (delay = duration); thêm scheduling chính xác khi cần
                 setTimeout(function () { self.noteOff(pitch); }, dur + 40);
@@ -60,20 +105,20 @@ window.TrackInstrument = window.TrackInstrument || {};
             }
         }
         // Fallback SonicSF (WASM)
-        try {
-            if (!window.SonicSF || !window.SonicSF.playNote) return;
-            this._ensure();
-            var durF = (durationMs != null ? durationMs : 500) || 500;
-            window.SonicSF.playNote(pitch, velocity != null ? velocity : 0.8, durF, startTime, this.program, this.dest, this.ch, this.synthEngine);
-        } catch (e) {
-            console.warn('[TrackInstrument] playNote error:', e);
-        }
+        this._fallbackPlayNote(pitch, velocity, durationMs, startTime);
     };
 
     TrackInstrument.prototype.noteOff = function (pitch) {
-        if (this._nativeReady()) {
-            try { window.SonicNativeAudio.noteOff('sf', this.trackId, this.ch, pitch); return; } catch (e) {}
+        var kind = this._nativeKind();
+        if (kind) {
+            try {
+                window.SonicNativeAudio.noteOff(kind, this.trackId, this.ch, pitch).catch(function () {
+                    // Native note-off fail -> stop qua WASM (neu note da fallback)
+                    try { if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(this.ch, pitch); } catch (e) {}
+                });
+            } catch (e) {}
         }
+        // Belt-and-suspenders: stopNote WASM vo hai neu khong co note dang phat.
         try {
             if (window.SonicSF && window.SonicSF.stopNote) window.SonicSF.stopNote(this.ch, pitch);
         } catch (e) {}

app/static/js/services/unifiedMidiRouter.js

@@ -3,7 +3,12 @@
 // hóa UnifiedMidiEvent → UnifiedMidiRouter → engine theo trackId. Một điểm
 // dispatch duy nhất: activeVoiceTracker đếm note-on/off đúng (hết stuck
 // notes), panicAllNotesOff() quét toàn bộ voice khi đổi instrument/engine
-// giữa chừng. Chưa nối vào app (T5–T7 sẽ đăng ký engine + dispatch).
+// giữa chừng.
+// Trạng thái nối (đối chiếu GIAI_PHAP 2026-08): ĐÃ nối cho PREVIEW — app.jsx
+// _routeNoteOn/_routeNoteOff (L212-260) đăng ký TrackInstrument per-track và
+// dispatch qua router (keybed/click/draw/timeline scheduler gọi _routePreviewNote
+// trước, chỉ fallback SonicSF.playNote khi router không xử lý). CHƯA nối cho
+// timeline scheduler per-item (vẫn gọi thẳng SonicSF.playNote / scheduleNativeSfItem).
 window.SonicUnifiedMidiRouter = window.SonicUnifiedMidiRouter || {};
 
 (function () {

app/static/vst_gui.html

@@ -0,0 +1,132 @@
+<!DOCTYPE html>
+<html lang="vi">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>VST GUI</title>
+<style>
+  :root { color-scheme: dark; }
+  * { box-sizing: border-box; }
+  body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", sans-serif; background: #16161a; color: #e4e4e7; }
+  header { display: flex; align-items: center; justify-content: space-between; padding: 8px 12px; background: #1e1e24; border-bottom: 1px solid #2d2d35; position: sticky; top: 0; z-index: 10; }
+  header h1 { font-size: 13px; margin: 0; font-weight: 600; color: #7dd3fc; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  header .meta { font-size: 10px; color: #71717a; margin-top: 2px; }
+  #params { padding: 10px 12px; }
+  .param { display: grid; grid-template-columns: minmax(0,1fr) 60px; align-items: center; gap: 8px; padding: 6px 0; border-bottom: 1px solid #26262d; }
+  .param .title { font-size: 11px; color: #d4d4d8; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+  .param .val { font-size: 10px; font-family: ui-monospace, monospace; color: #7dd3fc; text-align: right; }
+  input[type=range] { width: 100%; accent-color: #0ea5e9; }
+  #status { padding: 8px 12px; font-size: 11px; color: #a1a1aa; }
+  #status.err { color: #f87171; }
+</style>
+</head>
+<body>
+<header>
+  <div>
+    <h1 id="title">VST GUI</h1>
+    <div class="meta" id="meta"></div>
+  </div>
+  <button id="closeBtn" style="background:#3f3f46;border:1px solid #52525b;color:#f4f4f5;font-size:11px;padding:4px 10px;border-radius:4px;cursor:pointer;">Đóng</button>
+</header>
+<div id="params"></div>
+<div id="status">Đang tải tham số…</div>
+
+<script>
+(function () {
+  const qs = new URLSearchParams(window.location.search);
+  const trackId = qs.get('track') || '';
+  const pluginId = qs.get('plugin') || '';
+  const el = (id) => document.getElementById(id);
+
+  el('title').textContent = 'VST GUI - ' + pluginId;
+  el('meta').textContent = 'track=' + trackId;
+
+  const invoke = (cmd, args) => {
+    if (window.__TAURI__ && window.__TAURI__.core) {
+      return window.__TAURI__.core.invoke(cmd, args);
+    }
+    return Promise.reject(new Error('Tauri core unavailable'));
+  };
+
+  let params = [];
+
+  function render() {
+    const box = el('params');
+    box.innerHTML = '';
+    if (!params.length) {
+      el('status').textContent = 'Plugin không có tham số (hoặc chưa nạp).';
+      return;
+    }
+    el('status').textContent = params.length + ' tham số — kéo slider để đổi giá trị.';
+    params.forEach((p) => {
+      const row = document.createElement('div');
+      row.className = 'param';
+      const title = document.createElement('div');
+      title.className = 'title';
+      title.textContent = p.title || ('Param ' + p.param_id);
+      title.title = title.textContent;
+      const val = document.createElement('div');
+      val.className = 'val';
+      const range = document.createElement('input');
+      range.type = 'range';
+      range.min = 0;
+      range.max = 1;
+      range.step = 0.001;
+      range.value = Math.min(1, Math.max(0, p.value || 0));
+      val.textContent = (p.value || 0).toFixed(3);
+      let dragging = false;
+      range.addEventListener('input', () => {
+        val.textContent = Number(range.value).toFixed(3);
+      });
+      range.addEventListener('change', () => {
+        invoke('set_vst_param', { trackId: trackId, pluginId: pluginId, paramId: p.param_id, value: Number(range.value) })
+          .catch((err) => { el('status').className = 'err'; el('status').textContent = 'set_vst_param lỗi: ' + (err && (err.message || err)); });
+      });
+      row.appendChild(title);
+      row.appendChild(val);
+      row.appendChild(range);
+      box.appendChild(row);
+    });
+  }
+
+  // Sync 2 chiều: native editor đổi param → Rust emit vst_param_changed → cập nhật slider.
+  function onParamChanged(e) {
+    const d = e.payload || {};
+    if (d.param_id === undefined) return;
+    const p = params.find((x) => x.param_id === d.param_id);
+    if (p) {
+      p.value = d.value;
+      const ranges = document.querySelectorAll('input[type=range]');
+      const idx = params.indexOf(p);
+      if (ranges[idx]) ranges[idx].value = Math.min(1, Math.max(0, d.value));
+      const vals = document.querySelectorAll('.val');
+      if (vals[idx]) vals[idx].textContent = Number(d.value).toFixed(3);
+    }
+  }
+
+  function init() {
+    invoke('get_vst_params', { trackId: trackId, pluginId: pluginId }).then((list) => {
+      params = list || [];
+      render();
+    }).catch((err) => {
+      el('status').className = 'err';
+      el('status').textContent = 'get_vst_params lỗi: ' + (err && (err.message || err)) + ' — plugin chưa mở được (kiểm tra log Rust / bridge DLL).';
+    });
+  }
+
+  el('closeBtn').addEventListener('click', () => {
+    invoke('close_vst_editor', { trackId: trackId, pluginId: pluginId }).catch(() => {});
+    window.close();
+  });
+  window.addEventListener('beforeunload', () => {
+    invoke('close_vst_editor', { trackId: trackId, pluginId: pluginId }).catch(() => {});
+  });
+
+  if (window.__TAURI__ && window.__TAURI__.event) {
+    window.__TAURI__.event.listen('vst_param_changed', onParamChanged).catch(() => {});
+  }
+  init();
+})();
+</script>
+</body>
+</html>

src-tauri/Cargo.lock

@@ -2880,6 +2880,8 @@ dependencies = [
  "tauri-build",
  "tauri-plugin-dialog",
  "tauri-plugin-shell",
+ "webview2-com",
+ "windows-core 0.61.2",
 ]
 
 [[package]]

src-tauri/Cargo.toml

@@ -16,6 +16,8 @@ tauri = { version = "2", features = [] }
 tauri-plugin-shell = "2"
 tauri-plugin-dialog = "2"
 raw-window-handle = "0.6"
+webview2-com = "0.38"
+windows-core = "0.61"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 

src-tauri/src/lib.rs

@@ -18,6 +18,7 @@ use std::path::{Path, PathBuf};
 use std::sync::Mutex;
 
 mod vst_gui;
+mod permissions;
 
 struct EngineProcess(Mutex<Option<CommandChild>>);
 
@@ -77,6 +78,9 @@ pub fn run() {
         .plugin(tauri_plugin_dialog::init())
         .invoke_handler(tauri::generate_handler![vst_gui::open_vst_gui, vst_gui::set_vst_param, vst_gui::get_vst_params, vst_gui::close_vst_editor])
         .setup(|app| {
+            permissions::install(
+                &app.get_webview_window("main").expect("main window missing"),
+            );
             vst_gui::init(app.handle());
             let res_dir = app
                 .path()

src-tauri/src/permissions.rs

@@ -0,0 +1,27 @@
+// Standalone permissions (Bug 5): WebView2 auto-ALLOW mọi permission request
+// (MIDI input, microphone, File System Access) — không hiện popup hỏi quyền.
+// WebView2 mặc định DENY khi không có handler ICoreWebView2::add_PermissionRequested.
+#![cfg(windows)]
+
+use webview2_com::Microsoft::Web::WebView2::Win32::*;
+use webview2_com::PermissionRequestedEventHandler;
+
+pub fn install(window: &tauri::WebviewWindow) {
+    let _ = window.with_webview(|webview| {
+        unsafe {
+            if let Ok(core) = webview.controller().CoreWebView2() {
+                let handler = PermissionRequestedEventHandler::create(Box::new(
+                    |_sender: Option<ICoreWebView2>,
+                     args: Option<ICoreWebView2PermissionRequestedEventArgs>| {
+                        if let Some(args) = args {
+                            args.SetState(COREWEBVIEW2_PERMISSION_STATE_ALLOW)?;
+                        }
+                        Ok(())
+                    },
+                ));
+                let mut token = 0i64;
+                let _ = core.add_PermissionRequested(&handler, &mut token);
+            }
+        }
+    });
+}