fix process_fn

app.py

@@ -72,8 +72,8 @@ def process_fn(audio_file_path, model_name):
         filename = f"demucs_{model_name}_{stem_name.lower()}.wav"
         output_audio_path = save_audio(signal, filename)
         outputs.append(output_audio_path)
-    return *outputs 
-    
+    return tuple(outputs)
+
 # Gradio App 
 with gr.Blocks() as demo:
     input_audio = gr.Audio(type="filepath", label="Input Audio").harp_required(True)