fix: sfload reset_presets=0 giữ nguyên instrument các track khác; preloadTrackInstruments module-level (sửa ReferenceError reload); truyền props cho ProfileModal; lọc warning No preset found channel 9

app/static/js/services/soundfontPlayer.js

@@ -106,6 +106,11 @@
                         },
                         TOTAL_MEMORY: TOTAL_MEMORY,
                         printErr: function (msg) {
+                            // "No preset found on channel" is FluidSynth's
+                            // expected notice when a soundfont simply has no
+                            // preset for a bank (e.g. bank 128 on a melodic-only
+                            // font) — the note is just silent, not an error.
+                            if (msg && msg.indexOf('No preset found on channel') !== -1) return;
                             console.warn('[FluidSynth:err]', msg);
                         }
                     });
@@ -192,7 +197,12 @@
             try { _fluidModule.FS.unlink(fname); } catch (e) {}
             _fluidModule.FS.writeFile(fname, new Uint8Array(buf));
             var cPath = this._allocCStr(fname);
-            var handle = _fluidModule._fluid_synth_sfload(_synthPtr, cPath, 1);
+            // reset_presets = 0: loading a NEW soundfont must NOT reset the
+            // presets already selected on other channels. With 1, FluidSynth
+            // re-points every channel to the new font's preset 0, so loading a
+            // second instrument silently changes the first one's sound
+            // (decay/loop envelope…).
+            var handle = _fluidModule._fluid_synth_sfload(_synthPtr, cPath, 0);
             _fluidModule._free(cPath);
             try { _fluidModule.FS.unlink(fname); } catch (e) {}
             return handle;