UPDATE

app.py

@@ -173,7 +173,7 @@ async def buttons_handler(event):
 async def audio_effect_handler(event):
     user_id = event.sender_id
     if user_id not in states or not states[user_id]:
-        await event.answer("`No audio file found. Please use /buttons command to upload an audio file.`")
+        await event.answer("No audio file found. Please use /buttons command to upload an audio file.")
         return
 
     # Retrieve the audio file from the user's state
@@ -192,11 +192,14 @@ async def audio_effect_handler(event):
             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] = modified_sound
 
-        await event.answer"Effect applied. Click 'Send' to receive the modified audio file.")
+        await event.answer("Effect applied. Click /send to receive the modified audio file.")
 
     except Fusion.InvalidMusicFileError as e:
         await event.reply(str(e))
@@ -217,7 +220,7 @@ async def preview_handler(event):
         # Clean up - remove the saved preview audio file
         os.remove(output_file)
     else:
-        await event.answer("`No modified audio file found. Please apply an effect first.`")
+        await event.answer("No modified audio file found. Please apply an effect first.")
 
 
 async def send_handler(event):