How to mute any microphone in macOS Catalina
After searching and failing for days to find a way to mute my Focusrite Scarlett Solo-powered Shure SM7B on macOS Catalina, I finally stumbled on Rogue Amoeba's SourceSource.
It enables you to do whole bunch of really cool stuff, such as redirecting audio to different outputs per-application/source, controlling audio output levels on devices that you can't normally do that with (like my Schiit Modi 3), and boosting music dynamically (not unlike Boom does; so if you already use that this might be a good all-in-one replacement.)
Most importantly, though, it allows you to control your input volume and mute your microphone right from your status bar. You'll notice in my screenshot above I have my input muted there. I can unmute it by clicked the volume icon there again.
I wish there was a global hotkey to invoke input muting, but if there is a way to do that I haven't found it yet. Regardless, it's a super helpful app.
SoundSource isn't free but Rogue Amoeba offers a trial. Give it a shot and see how it works for you.