fix(v9): 5 bugs — GUI deferred until VST loaded (no white window), fixed retry 8x500ms, VST3 folder resolve for auto-load, sustain-CC64 dropped after STOP, taskkill process tree on exit, Synth+GUI same row in TCP

app/api/v1/plugins.py

@@ -1269,6 +1269,16 @@ def _resolve_bridge_asset(name: str, instrument_type: str, path: Optional[str])
                     if fn.lower().endswith(ext) and \
                        (fn.lower() == base.lower() or os.path.splitext(fn)[0].lower() == base_noext):
                         return os.path.join(root, fn)
+            # V9 bug 8: Windows VST3 = FOLDER "X.vst3" (chua X.vst3.dll) —
+            # khong la file nen file-walk tren khong thay -> resolve null ->
+            # bridge load fail -> VSTi khong auto-load khi mo project. Scan
+            # sub-folder trung ten: "x.vst3" == base.lower() hoac "x" ==
+            # base_noext.
+            for sub in os.listdir(root):
+                sp = os.path.join(root, sub)
+                if os.path.isdir(sp) and sub.lower().endswith(ext) and \
+                   (sub.lower() == base.lower() or os.path.splitext(sub)[0].lower() == base_noext):
+                    return sp
     return None
 
 @router.post("/bridge/load")

app/static/js/app.jsx

@@ -5768,7 +5768,7 @@ const PluginManagerModal = ({ isOpen, onClose, pluginsData, onInsertInstrument }
       // Requirement 2: VST3 load → mở native GUI ngay (C++ attach editor vào
       // cửa sổ bridge tự tạo — control type=4, hwnd=0).
       if (ok && type === 'VST3' && window.NativeBridgeService.openNativeGUI) {
-        try { await window.NativeBridgeService.openNativeGUI(name); } catch (e) {}
+        try { await openVstGuiRetry(name, 0, 8); } catch (e) {}
       }
       return ok;
     } catch (err) {
@@ -6210,17 +6210,20 @@ const ensureAndOpenVstGui = async (trackId, instrumentId) => {
     const ok = await loadVstToBridge({ id: trackId, instrumentId });
     if (!ok) return;
   }
-  try { await openVstGuiRetry(instrumentId, bch, 5); } catch (e) { console.warn('[Bridge] openNativeGUI fail:', e); }
+  try { await openVstGuiRetry(instrumentId, bch, 8); } catch (e) { console.warn('[Bridge] openNativeGUI fail:', e); }
 };
-// V8 bug 4: C++ load instrument ASYNC (worker thread) — OPEN_GUI gui toi truoc
+// V8 bug 4 + V9 bug 3/6/7: C++ load instrument ASYNC (worker thread) — OPEN_GUI
-// khi assign() xong → instruments.get(guiCh) null → "GUI attach FAILED" →
+// som → C++ defer (chi log stderr, invoke van tra Ok) → retry PHAI chay DU so
-// nen trang. Retry mo GUI nhieu lan, cach 400ms cho load xong.
+// lan, khong `return true` som. Mo GUI co the can cho den khi assign() xong
+// (Nexus ~1-2s) — 8 lan x 500ms, window reuse khi load xong.
 const openVstGuiRetry = async (instrumentId, bch, attempts) => {
-  for (let i = 0; i < (attempts || 5); i++) {
+  const n = (attempts && attempts > 0) ? attempts : 8;
-    try { await window.NativeBridgeService.openNativeGUI(instrumentId, bch); return true; } catch (e) { console.warn('[Bridge] openNativeGUI retry', i + 1, e); }
+  for (let i = 0; i < n; i++) {
-    await new Promise(r => setTimeout(r, 400));
+    try { await window.NativeBridgeService.openNativeGUI(instrumentId, bch); }
+    catch (e) { console.warn('[Bridge] openNativeGUI retry', i + 1, e); }
+    await new Promise(r => setTimeout(r, 500));
   }
-  return false;
+  return true;
 };
 // Module-level so both ProfileModal (open project) and App (auto-restore) can
 // warm the FluidSynth font cache for each track's instrument. This only loads
@@ -15510,7 +15513,7 @@ const App = () => {
         // Requirement 2: chọn VST3 qua nút Synth → load xong mở native GUI
         // (C++ attach editor vào cửa sổ bridge tự tạo — control type=4, hwnd=0).
         if (ok && btype === 'VST3' && window.NativeBridgeService.openNativeGUI) {
-          try { await openVstGuiRetry(instrumentId, bch, 5); } catch (e) {}
+          try { await openVstGuiRetry(instrumentId, bch, 8); } catch (e) {}
         }
       }
     })();
@@ -29840,20 +29843,20 @@ STRICT CONSTRAINTS:
         className: "text-zinc-500 font-normal"
       }, track.fxType || "None")), /*#__PURE__*/React.createElement("button", {
         onClick: (e) => { e.stopPropagation(); openInstrumentSelector(track.id); },
-        className: "px-1.5 py-0.5 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-[10px] font-bold flex items-center gap-1 max-w-[70px] shrink-0"
+        className: "px-1.5 py-0.5 bg-zinc-800 hover:bg-zinc-700 text-amber-400 border border-amber-800 rounded text-[10px] font-bold flex items-center gap-1 max-w-[90px] shrink-0"
       }, /*#__PURE__*/React.createElement("span", {
         className: "inline-flex items-center shrink-0"
       }, /*#__PURE__*/React.createElement("i", {
         "data-lucide": "music",
         className: "w-2.5 h-2.5 shrink-0"
-      })), /*#__PURE__*/React.createElement("span", { className: "truncate text-[10px] min-w-0" }, track.instrumentName || track.instrumentId || "Synth"), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-3 h-3 shrink-0" }))), (track.instrumentId && typeof track.instrumentId === 'string' && !track.instrumentId.startsWith('sf_') ? /*#__PURE__*/React.createElement("button", {
+      })), /*#__PURE__*/React.createElement("span", { className: "truncate text-[10px] min-w-0" }, track.instrumentName || track.instrumentId || "Synth"), /*#__PURE__*/React.createElement("i", { "data-lucide": "chevron-down", className: "w-3 h-3 shrink-0" }))), /*#__PURE__*/React.createElement("div", { className: "flex items-center gap-0.5 shrink-0 min-w-0" }, (track.instrumentId && typeof track.instrumentId === 'string' && !track.instrumentId.startsWith('sf_') ? /*#__PURE__*/React.createElement("button", {
         onClick: (e) => {
           e.stopPropagation();
           ensureAndOpenVstGui(track.id, track.instrumentId);
         },
         title: "Mở lại GUI VSTi",
         className: "px-1 py-0.5 bg-zinc-800 hover:bg-zinc-700 text-violet-300 border border-violet-800 rounded text-[9px] font-bold flex items-center gap-0.5 shrink-0"
-      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "sliders-horizontal", className: "w-2.5 h-2.5 shrink-0" }), /*#__PURE__*/React.createElement("span", { className: "truncate text-[8px] min-w-0" }, "GUI")) : null), /*#__PURE__*/React.createElement("div", {
+      }, /*#__PURE__*/React.createElement("i", { "data-lucide": "sliders-horizontal", className: "w-2.5 h-2.5 shrink-0" }), /*#__PURE__*/React.createElement("span", { className: "truncate text-[8px] min-w-0" }, "GUI")) : null)), /*#__PURE__*/React.createElement("div", {
         onMouseDown: e => handleTrackResizeMouseDown(e, track.id),
         className: "absolute bottom-0 left-0 right-0 h-1 cursor-ns-resize z-30 hover:bg-cyan-500/50 transition-colors",
         onClick: e => e.stopPropagation()

app/templates/index.html

@@ -50,7 +50,7 @@
     <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=202608132130" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608132205" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {

native_bridge/src/main.cpp

@@ -306,6 +306,11 @@ int main(int argc, char* argv[]) {
                 inst->noteOff(evt.channel, evt.pitch, 0);
                 break;
             case 0xB: // CC: controller number in pitch, value in data2
+                // V9 bug 4: sau STOP, drop sustain-down (CC64>0) — JS co the
+                // gui CC64 xuong sau STOP (note-on/CC timer tre); VSTi giu
+                // note khi pedal down -> am treo loop. CC64=0 (sustain-up)
+                // van cho qua.
+                if (transportStopped && evt.pitch == 64 && evt.data2 > 0) return;
                 inst->controlChange(evt.channel, evt.pitch, evt.data2);
                 break;
             case 0xC: // program change: program in data2
@@ -418,6 +423,17 @@ int main(int argc, char* argv[]) {
             } else if (c.type == 4) { // OPEN_GUI (A7): arg1 = parent HWND (0 → bridge tự tạo native window), arg2 = plugin id
                 uint32_t guiCh = c.channel;
                 if (guiCh >= 16) guiCh = 0;
+                // V9 bug 3/6/7: gate tren MAIN thread TRUOC khi tao window —
+                // instrument load ASYNC (worker thread); OPEN_GUI som -> attach
+                // job fail -> cua so trang van con song. Chua load xong =>
+                // defer: KHONG tao window, KHONG post job. JS retry
+                // openNativeGUI 8x500ms; khi assign xong nhay lai day, tao
+                // window 1 lan va attach OK.
+                if (!instruments.get(guiCh)) {
+                    std::cerr << "[NativeBridge] GUI deferred ch=" << guiCh
+                              << " plugin=" << c.arg2 << " (no instrument yet)" << std::endl;
+                    continue;
+                }
                 if (!workers[guiCh]) workers[guiCh] = std::make_unique<ChannelWorker>();
                 void* hwnd = (void*)(uintptr_t)c.arg1;
 #ifdef _WIN32

src-tauri/src/lib.rs

@@ -48,20 +48,31 @@ fn kill_bridge(app: &AppHandle) -> bool {
         Err(_) => return false,
     };
     match guard.take() {
-        Some(child) => match child.kill() {
+        Some(child) => {
-            Ok(()) => {
+            let ok = kill_process_tree(&child) || child.kill().is_ok();
+            if ok {
                 println!("Native Host Bridge killed (restart)");
-                true
+            } else {
+                println!("Bridge kill failed");
             }
-            Err(e) => {
+            ok
-                println!("Bridge kill failed: {e}");
-                false
         }
-        },
         None => false,
     }
 }
 
+/// Kill a child plus its whole process tree via taskkill /T /F. The engine
+/// (PyInstaller ONEDIR) and bridge are direct children, but /T guarantees no
+/// orphan subprocess stays behind when the DAW window closes.
+fn kill_process_tree(child: &CommandChild) -> bool {
+    let pid = child.pid();
+    std::process::Command::new("taskkill")
+        .args(["/PID", &pid.to_string(), "/T", "/F"])
+        .status()
+        .map(|s| s.success())
+        .unwrap_or(false)
+}
+
 /// Audio frame pushed to the WebView (bridge SHM -> `bridge-audio` event).
 #[derive(Clone, serde::Serialize)]
 struct AudioFrame {
@@ -479,6 +490,7 @@ pub fn run() {
                     .ok()
                     .and_then(|mut lock| lock.take());
                 if let Some(child) = child {
+                    kill_process_tree(&child);
                     let _ = child.kill();
                     println!("daw_engine sidecar terminated.");
                 }
@@ -490,6 +502,7 @@ pub fn run() {
                     .ok()
                     .and_then(|mut lock| lock.take());
                 if let Some(child) = bridge_child {
+                    kill_process_tree(&child);
                     let _ = child.kill();
                     println!("daw_vst_bridge sidecar terminated.");
                 }