FIX: Đã fix cross-machine (v202608060700)

app/static/js/services/soundfontPlayer.js

@@ -25,6 +25,7 @@
     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;
@@ -326,8 +327,15 @@
                 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);
@@ -543,10 +551,24 @@
                     // 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) {
                             console.log('[SonicSF] loadSoundFont result:', ok, 'for:', finalSfId);
-                            if (ok) doNote();
+                            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;
                     }