app.py

import gradio as gr

def identity(audio):
    return audio

with gr.Blocks() as demo:
    with gr.Row():
        with gr.Column():
            audio_in = gr.Audio(sources=["microphone"], type="filepath")
            run_button = gr.Button("Generate audio")
        with gr.Column():
            audio_out = gr.Audio(type="filepath")

    run_button.click(fn=identity, inputs=[audio_in], outputs=[audio_out])

demo.launch()