mac-volume: A CLI to control device volume

I've set my Mac up such that video calls such as Zoom use the microphone and earphones attached to my Behringer UMC204HD, which all other audio plays through the my normal speakers which are the default. One issue I have with this is that it's quite hard to change the volume when a call as the volume buttons on the Mac are connected to the default output. This finally annoyed me enough that I looked… continue reading.