I haven't encounter this error but I think I know how to fix that. Go to C:\Users\YourUsename\AppData\Roaming\Godot\app_userdata\Gazō Tuber. There, delete the "mic.save" file. Then restart the app.
If it still not working, Gazo Tuber might have problem handling condenser mic. I'll try fidure it out. Please report back if it's already working .
it works now! thank you :D