From 2b04b32ea86ee3667e75c37ecc2114ecabfbed65 Mon Sep 17 00:00:00 2001
From: 3dtours <yeunhiepanh.photo@gmail.com>
Date: Mon, 27 Jul 2026 16:08:54 +0700
Subject: [PATCH] =?UTF-8?q?fix:=20d=C3=B9ng=20fluid=5Fsynth=5Fprogram=5Fse?=
 =?UTF-8?q?lect=20thay=20v=C3=AC=20bank=5Fselect+program=5Fchange?=
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Khi load SF2, preset lookup của program_change dùng search order
(lần lượt qua các SF đã load). Track 1 load SF2→SF2 presets override
SF1 trên tất cả channel, track 2 chọn nhầm preset của SF2.
Fix: program_select(synth, ch, sfHandle, bank, prog) chỉ định rõ
SoundFont ID, không phụ thuộc search order.
---
 app/static/js/services/soundfontPlayer.js | 30 ++++++++++++++---------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index e236623..08812bb 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -239,12 +239,15 @@
             } else {
                 channel = _engineChMap[engKey];
             }
-            try {
-                _fluidModule._fluid_synth_bank_select(_synthPtr, channel, bank);
-            } catch (e) {}
-            try {
-                _fluidModule._fluid_synth_program_change(_synthPtr, channel, program);
-            } catch (e) {}
+            var sfHandle = _sfHandleMap.get(sfId);
+            if (sfHandle !== undefined) {
+                try {
+                    _fluidModule._fluid_synth_program_select(_synthPtr, channel, sfHandle, bank, program);
+                } catch (e) {}
+            } else {
+                try { _fluidModule._fluid_synth_bank_select(_synthPtr, channel, bank); } catch (e) {}
+                try { _fluidModule._fluid_synth_program_change(_synthPtr, channel, program); } catch (e) {}
+            }
             _channels[channel].bank = bank;
             _channels[channel].program = program;
             _channels[channel].isPercussion = (bank === 128);
@@ -368,12 +371,15 @@
                     ch = usedBank === 128 ? 9 : 0;
                 }
                 if (ch === undefined) ch = (usedBank === 128 ? 9 : 0);
-                try {
-                    _fluidModule._fluid_synth_bank_select(_synthPtr, ch, usedBank);
-                } catch (e) {}
-                try {
-                    _fluidModule._fluid_synth_program_change(_synthPtr, ch, usedProg);
-                } catch (e) {}
+                var sfHandle = synthEngine.soundfont_id ? _sfHandleMap.get(synthEngine.soundfont_id) : undefined;
+                if (sfHandle !== undefined) {
+                    try {
+                        _fluidModule._fluid_synth_program_select(_synthPtr, ch, sfHandle, usedBank, usedProg);
+                    } catch (e) {}
+                } else {
+                    try { _fluidModule._fluid_synth_bank_select(_synthPtr, ch, usedBank); } catch (e) {}
+                    try { _fluidModule._fluid_synth_program_change(_synthPtr, ch, usedProg); } catch (e) {}
+                }
             } else if (program !== undefined) {
                 usedProg = program;
                 if (ch === undefined) ch = 0;