fix: honor the soundfont -> baseUrl config

src/core/audio-interface/KGToneBuffersPool.ts

@@ -1,5 +1,6 @@
 import { SAMPLER_CONSTANTS } from '../../constants/coreConstants';
 import { FLUIDR3_INSTRUMENT_MAP } from '../../constants/generalMidiConstants';
+import { ConfigManager } from '../config/ConfigManager';
 import * as Tone from 'tone';
 
 /**
@@ -115,18 +116,23 @@ export class KGToneBuffersPool {
    * Create ToneAudioBuffers for an instrument
    */
   private async createToneAudioBuffers(name: string): Promise<Tone.ToneAudioBuffers> {
+    const configManager = ConfigManager.instance();
+    if (!configManager.getIsInitialized()) {
+      await configManager.initialize();
+    }
+
     return new Promise((resolve, reject) => {
       try {
-        // Get instrument configuration from constants
-        const fluidConfig = SAMPLER_CONSTANTS.TONE_SAMPLERS.FLUID;
         const instrumentName = name;
 
         if (!instrumentName) {
           throw new Error(`Unknown instrument: ${name}`);
         }
 
-        // Generate URL mapping for all keys from A0 to Bb7
-        const urls = this.generateKeyUrls(fluidConfig.url, instrumentName);
+        const baseUrl = (ConfigManager.instance().get('general.soundfont.base_url') as string)
+          || SAMPLER_CONSTANTS.TONE_SAMPLERS.FLUID.url;
+
+        const urls = this.generateKeyUrls(baseUrl, instrumentName);
 
         console.log(`Loading ToneAudioBuffers for ${name} (${instrumentName})...`);