FIX: sửa MASTERING PANEL có tác dụng với mainout

app/static/js/services/soundfontPlayer.js

@@ -25,6 +25,14 @@
     let _scheduledNotes = [];
 
     const getCtx = function () {
+        if (_audioCtx) {
+            if (!_gainNode) {
+                _gainNode = _audioCtx.createGain();
+                _gainNode.gain.value = 0.3;
+                _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+            }
+            return _audioCtx;
+        }
         if (typeof getAudioContext === 'function') {
             var ctx = getAudioContext();
             if (!_gainNode) {
@@ -67,6 +75,12 @@
                 try {
                     _audioCtx = audioContext;
                     if (_audioCtx.state === 'suspended') await _audioCtx.resume();
+                    // Create gain node for master bus routing before any node connections
+                    if (!_gainNode) {
+                        _gainNode = _audioCtx.createGain();
+                        _gainNode.gain.value = 0.3;
+                        _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                    }
 
                     console.log("[SonicSF] AudioCtx state:", _audioCtx.state, "sampleRate:", _audioCtx.sampleRate);
 
@@ -224,7 +238,7 @@
 
         selectInstrument: async function (channel, bank, program, sfId) {
             if (!_initialized || !_fluidModule) {
-                var ctx = new (window.AudioContext || window.webkitAudioContext)();
+                var ctx = (typeof getAudioContext === 'function') ? getAudioContext() : new (window.AudioContext || window.webkitAudioContext)();
                 await this.init(ctx);
             }
             if (sfId) {
@@ -350,7 +364,7 @@
             if (_initialized && _fluidModule) return;
             if (_initPromise) return;
             try {
-                var ctx = new (window.AudioContext || window.webkitAudioContext)();
+                var ctx = (typeof getAudioContext === 'function') ? getAudioContext() : new (window.AudioContext || window.webkitAudioContext)();
                 if (ctx.state === 'suspended') await ctx.resume();
                 await this.init(ctx);
             } catch (e) {}