Thanks for your help, but I figured out what was going on.
As penance for wasting your time on this, I’ll tell you the stupid thing I did:
My headphones weren’t working for some reason and I was trying to listen to the headphone-made recordings before disconnecting from the headphones. Therefore all the headphone recordings didn’t make a noise.
For some reason, my headphones outputted some feedback but no audio, this gave me the impression that the problem was the input not the output.
egg on face etc
Thanks again!