UPDATE

app.py

@@ -86,6 +86,6 @@ with gr.Blocks() as iface:
     ]
     outputs = gr.Audio(label="Download processed music", type="filepath")
     btn = gr.Button("Run")
-    btn.click(fn=process_audio, inputs=name, outputs=outputs, title="Audio Fusion", api_name="AudioFusion")
+    btn.click(fn=process_audio, inputs=inputs, outputs=outputs, title="Audio Fusion", api_name="AudioFusion")
 
 iface.launch(share=False)