From b5344e41f749352e97ec40126b38c71b4f1a847e Mon Sep 17 00:00:00 2001
From: 3dtours <yeunhiepanh.photo@gmail.com>
Date: Mon, 27 Jul 2026 20:09:49 +0700
Subject: [PATCH] fix: default instrument for tracks without instrument set

_playNoteFluid: when no synthEngine and no program, fallback to
program 0 on channel (default piano) so unconfigured tracks still
produce sound via FluidSynth
---
 app/static/js/services/soundfontPlayer.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index 4edc156..b2ecae9 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -392,6 +392,11 @@
                 try {
                     _fluidModule._fluid_synth_program_change(_synthPtr, ch, usedProg);
                 } catch (e) {}
+            } else {
+                if (ch === undefined) ch = 0;
+                try {
+                    _fluidModule._fluid_synth_program_change(_synthPtr, ch, 0);
+                } catch (e) {}
             }
             if (ch === undefined) ch = (usedBank === 128 ? 9 : 0);
             var ctx = getCtx();