Yes. Audio-only recording is available for use in MCU 2.0
To apply audio-only recording, the user has to set video=false in joinRoom
the output file would be an audio file in an MP4 container.
You can check it with following demo. if the clients does not connect just refresh the page.
https://temasys-cdn.s3.amazonaws.com/jo/2.x.x/demos/kitchensink/app/index.html?room=1576651544361