Update

app.py

@@ -199,7 +199,7 @@ async def audio_effect_handler(event):
         
 
     # Update the user's state with the modified sound
-    states[user_id]['audio'] = modified_sound
+    states[user_id]['audio'] = modified_sound.raw_data
 
     await event.answer("Effect applied. Click /send to receive the modified audio file.", alert="True")