UPDATE

app.py

@@ -183,31 +183,26 @@ async def audio_effect_handler(event):
     audio_file = states[user_id]['audio']
 
     query = event.pattern_match.group(1).decode("UTF-8")
-    try:
-        sound = Fusion.from_file(audio_file, format="mp3")
-        if query == 'slowed':
-            modified_sound = Fusion.effectSlowed(sound, 0.9)
-        elif query == 'speedup':
-            modified_sound = Fusion.effectSlowed(sound, 1.1)
-        elif query == '8d':
-            modified_sound = Fusion.effect8D(sound)
-        elif query == 'reverb':
-            modified_sound = Fusion.effectReverb(sound)
-        elif query == 'reverse':
-            modified_sound = sound.reverse()
-        else:
-            return await event.answer("INvalid for now...")
-            
+    sound = Fusion.from_file(audio_file, format="mp3")
+    if query == 'slowed':
+        modified_sound = Fusion.effectSlowed(sound, 0.9)
+    elif query == 'speedup':
+        modified_sound = Fusion.effectSlowed(sound, 1.1)
+    elif query == '8d':
+        modified_sound = Fusion.effect8D(sound)
+    elif query == 'reverb':
+        modified_sound = Fusion.effectReverb(sound)
+    elif query == 'reverse':
+        modified_sound = sound.reverse()
+    else:
+        return await event.answer("INvalid for now...")
+        
 
-        # Update the user's state with the modified sound
-        states[user_id]['audio'] = modified_sound
+    # Update the user's state with the modified sound
+    states[user_id]['audio'] = modified_sound
 
-        await event.answer("Effect applied. Click /send to receive the modified audio file.", alert="True")
+    await event.answer("Effect applied. Click /send to receive the modified audio file.", alert="True")
 
-    except Fusion.InvalidMusicFileError as e:
-        await event.reply(str(e))
-    except Exception as e:
-        await event.reply(f"An error occurred: {str(e)}")
 
 
 @client.on(events.CallbackQuery(pattern=b'preview'))
@@ -216,7 +211,7 @@ async def preview_handler(event):
     if user_id in states and states[user_id]:
         # Send the current modification for preview
         output_file_name = f"{user_id}_preview"
-        output_file = Fusion.saveSound(states[user_id], output_file_name)
+        output_file = Fusion.saveSound(states[user_id]['audio'], output_file_name)
         await event.edit("`Uploading...`", buttons=buttons)
         # Edit the message and send the audio file in the edited message
         await event.edit(file=output_file, text="`Preview the current modification:`", buttons=buttons)