V45.28: fix wobble preview VST2 loop/tremolo khi nhan chord - ring worklet bridgeAudioWorklet 32->48 block (~256ms) hap thu stall render loop C++ khi chord nhieu voice (stall >170ms -> underrun lap lai fade ve 0 nghe nhu wobble; 16->32 V45.27 da dung crackle, 32 chua du cho chord); overrun crossfade tich luy moi block drop cong 256 mau cap 1024 (~21ms) thay vi co dinh 64 mau (1.3ms qua ngan -> blip/wow khi drop loat block o chord nhieu voice). v=202608311820

app/static/js/services/bridgeAudioNode.js

@@ -32,7 +32,7 @@
       console.warn('[BridgeAudioNode] AudioWorklet unavailable — ScriptProcessor fallback');
       return false;
     }
-    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608311809';
+    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608311820';
     _ctx.audioWorklet.addModule(url).then(function () {
       if (!_initialized) return; // disconnect() happened while loading
       if (_useWorklet) return;   // already set up (init retry)

app/static/js/services/bridgeAudioWorklet.js

@@ -1,24 +1,28 @@
 // app/static/js/services/bridgeAudioWorklet.js
 // VSTi crackle fix: audio sink chay tren audio thread (khong jank main thread).
-// - Ring block 256 mau, toi da 32 block (~170ms @48k) — hap thu jitter pump
+// - Ring block 256 mau, toi da 48 block (~256ms @48k) — hap thu jitter pump
-//   (V45.27: 16->32 de dung crackle VST2 loop/tremolo — render loop C++ bi
+//   (V45.28: 32->48 de dung wobble VST2 loop/tremolo khi nhan chord — chord
-//   stall khi instrument xu li loop/tremolo nang CPU; 8->16 truoc do da dung
+//   nhieu voice -> render loop C++ stall dai hon ~170ms -> underrun lap lai
-//   tremolo crackle, 16 van chua du cho stall >85ms). Flush o play start
+//   (fade ve 0) nghe nhu wobble; 8->16 (V45) dung tremolo crackle, 16->32
-//   (app.jsx) xoa ring nen do tre khong tang: ring thuong can o preview.
+//   (V45.27) dung crackle, 32 van chua du cho stall chord). Flush o play
+//   start (app.jsx) xoa ring nen do tre khong tang: ring thuong can o preview.
 // - Underrun: fade ve 0 thay vi click (hard silence).
 // - Resume sau silence: fade vao tu 0.
-// - Overrun: drop block cu nhat + crossfade 64 mau tai diem drop (het click).
+// - Overrun: drop block cu nhat + crossfade tich luy — moi block drop cong
+//   256 mau fade, cap 1024 (~21ms) — crossfade dai de tranh blip/wow khi
+//   chord nhieu voice bi drop loat block (64 mau = 1.3ms qua ngan).
 // - Stats: dem overrun/underrun, gui ve main thread moi ~0.5s — kiem tra
 //   con crackle nao la do ring can (underrun) hay ring tran (overrun).
 class BridgeAudioSinkProcessor extends AudioWorkletProcessor {
   constructor() {
     super();
     this._ring = [];
-    this._MAX = 32;
+    this._MAX = 48;
     this._gain = 1.0;
     this._lastOutL = 0.0;
     this._lastOutR = 0.0;
-    this._skipFade = 0;      // >0: crossfade dang chay sau overrun drop
+    this._skipFade = 0;      // >0: con lai cua crossfade dang chay sau overrun drop
+    this._fadeLen = 0;       // tong chieu dai crossfade hien tai (cap 1024)
     this._skipFromL = 0.0;
     this._skipFromR = 0.0;
     this._wasUnderrun = false;
@@ -31,14 +35,18 @@ class BridgeAudioSinkProcessor extends AudioWorkletProcessor {
         this._ring.push({ l: m.l, r: m.r });
         while (this._ring.length > this._MAX) {
           // overrun: bo block cu nhat; lan consume toi se crossfade ranh gioi
+          // (tich luy: moi block drop cong 256 mau fade, cap 1024 — crossfade
+          // dai hon de tranh blip/wow khi drop loat block o chord nhieu voice)
           this._ring.shift();
-          this._skipFade = 64;
+          this._skipFade = Math.min(this._skipFade + 256, 1024);
+          this._fadeLen = this._skipFade;
           this._stats.overruns++;
         }
       } else if (m.type === 'flush') {
         this._ring.length = 0;
         this._gain = 1.0;
         this._skipFade = 0;
+        this._fadeLen = 0;
       }
     };
   }
@@ -56,8 +64,9 @@ class BridgeAudioSinkProcessor extends AudioWorkletProcessor {
         const avail = blk.l.length;
         const take = Math.min(avail, n - w);
         if (this._skipFade > 0) {
+          const done = this._fadeLen - this._skipFade;
           for (let i = 0; i < take; i++) {
-            const t = i / 64;
+            const t = (done + i) / this._fadeLen;
             L[w + i] = (this._lastOutL * (1 - t) + blk.l[i] * t) * this._gain;
             R[w + i] = (this._lastOutR * (1 - t) + blk.r[i] * t) * this._gain;
           }

app/templates/index.html

@@ -40,7 +40,7 @@
     <script src="/static/js/services/soundfontStorage.js?v=202608290945"></script>
     <script src="/static/js/services/soundfontPlayer.js?v=202608290945"></script>
     <script src="/static/js/services/nativeBridgeService.js?v=202608291510"></script>
-    <script src="/static/js/services/bridgeAudioNode.js?v=202608311809"></script>
+    <script src="/static/js/services/bridgeAudioNode.js?v=202608311820"></script>
     <script src="/static/js/services/unifiedMidiRouter.js?v=202608311756"></script>
     <script src="/static/js/services/audioRoutingEngine.js?v=202608290945"></script>
     <script src="/static/js/services/aiGateway.js?v=202608290945"></script>