diff --git a/app/static/js/services/soundfontPlayer.js b/app/static/js/services/soundfontPlayer.js
index f040c13..1e28d13 100644
--- a/app/static/js/services/soundfontPlayer.js
+++ b/app/static/js/services/soundfontPlayer.js
@@ -73,13 +73,15 @@
                     }
 
                     console.log("[SonicSF] Initializing FluidSynth WASM Engine...");
+                    var TOTAL_MEMORY = 256 * 1024 * 1024;
                     _fluidModule = await window.__FluidSynthModuleFactory({
                         locateFile: function (path) {
                             if (path.endsWith('.wasm')) {
                                 return window.__FluidSynthLocateWasm ? window.__FluidSynthLocateWasm() : path;
                             }
                             return path;
-                        }
+                        },
+                        TOTAL_MEMORY: TOTAL_MEMORY
                     });
 
                     if (!_fluidModule || !_fluidModule._new_fluid_settings) {
@@ -135,12 +137,31 @@
                     buf = await resp.arrayBuffer();
                     if (cache) await cache.saveBuffer(sfId, buf);
                 }
-                var virtualPath = '/soundfonts/' + sfId + '.sf3';
+                var ext = '.sf3';
+                var virtualPath = '/soundfonts/' + sfId + ext;
+                console.log("[SonicSF] Writing to MEMFS:", virtualPath, (buf.byteLength / 1024 / 1024).toFixed(2) + 'MB');
+                try { _fluidModule.FS.unlink(virtualPath); } catch (e) {}
                 _fluidModule.FS.writeFile(virtualPath, new Uint8Array(buf));
+                var fsSize = 0;
+                try { fsSize = _fluidModule.FS.stat(virtualPath).size; } catch (e) {}
+                console.log("[SonicSF] MEMFS stat:", fsSize, "bytes");
                 var sfHandle = _fluidModule._fluid_synth_sfload(_synthPtr, virtualPath, 1);
                 if (sfHandle === -1) {
-                    console.error("[SonicSF] FluidSynth failed to parse:", sfId);
-                    return false;
+                    var errPtr = _fluidModule._fluid_synth_error(_synthPtr);
+                    var errMsg = errPtr ? _fluidModule.UTF8ToString(errPtr) : "unknown";
+                    console.warn("[SonicSF] sfload failed for", sfId, "as", ext, "error:", errMsg);
+                    try { _fluidModule.FS.unlink(virtualPath); } catch (e) {}
+                    ext = '.sf2';
+                    virtualPath = '/soundfonts/' + sfId + ext;
+                    _fluidModule.FS.writeFile(virtualPath, new Uint8Array(buf));
+                    sfHandle = _fluidModule._fluid_synth_sfload(_synthPtr, virtualPath, 1);
+                    if (sfHandle === -1) {
+                        var errPtr2 = _fluidModule._fluid_synth_error(_synthPtr);
+                        var errMsg2 = errPtr2 ? _fluidModule.UTF8ToString(errPtr2) : "unknown";
+                        console.error("[SonicSF] FluidSynth failed to parse", sfId, "even as .sf2:", errMsg2);
+                        return false;
+                    }
+                    console.log("[SonicSF] Loaded", sfId, "as .sf2 fallback, handle:", sfHandle);
                 }
                 _sfHandleMap.set(sfId, sfHandle);
                 _currentSfId = sfId;