I have some audio playing from my computer I'd like to record.
I don't want to use the microphone, as this would produce feedback. I want to record straight from whatever the computer is spitting out.
Step 1: Enable "Stereo Mix"
if you don't see it, you can try looping:
you can use Soundflower:
Soundflower is a free, open source MacOS system extension that allows applications to pass audio to other applications. Soundflower is easy to use, it simply presents itself as an audio device, allowing any audio application to send and receive audio with no other support needed.
Step 2: Use a software like Audacity to record "Stereo Mix", or your loop.