Only record audio

I would like to just record the audio of some live streams, no video. It will be a 24/7 live audio recorder. I have searched online and I can’t find anything that will work, except by using a dvr software and modifying it to ignore video. Has anyone tried this? Thoughts?

We don’t have a specific option to record only audio. If would suggest using ffmpeg and some command line options to record audio only.