fix download button

front/src/components/AudioPlayer.tsx

@@ -14,15 +14,15 @@ export const AudioPlayer: React.FC<AudioPlayerProps> = ({ audioBuffer }) => {
   }, [audioBuffer]);
 
   const downloadUrl = useMemo(() => {
-    const wavArrayBuffer = audioBufferToWav(audioBuffer, { float32: false });
-    const base64 = encode(wavArrayBuffer);
-    return `data:audio/wav;base64,${base64}`;
+    const wavBlob = blobFromAudioBuffer(audioBuffer);
+    return URL.createObjectURL(wavBlob);
   }, [audioBuffer]);
 
   // Clean up the object URL when the component unmounts or audioBuffer changes.
   useEffect(() => {
     return () => {
       URL.revokeObjectURL(blobUrl);
+      URL.revokeObjectURL(downloadUrl);
     };
   }, [blobUrl]);