I am also having problems with Catalina. Yesterday downloaded the software to trial, excellent, it worked every time i used it, even after restarting my Imac, so, I paid for the software, but now it just doesn't see any audio feed.
The input on my Imac system prefs are ok, I can see the sound bar moving, so the USB audio codec is working, but when I open the Wizard or Record, here is no sound levels showing in the 'record volume calibration' in GR.
Tried to download again and put in my registration code - no effect
Any ideas guys?
Just tried Wave Pad, and this is able to record from the same input that GR is not able to.