Boy that was a close call! I almost gave up and was ready to scrap the project library and REINSTALL Cubasis – just cuz someone said that fixed the audio input issue described. In my case, USB input was working with GarageBand and Jamup, but not with Cubasis or MultiTrack DAW. I was baffled, it was happening in both Apogee Jam and Alesis IO4.
I came across another issue though: there’s no way to reimport project files once you export them. Or is there?
Anyway, TURNING MIC ON IN PRIVACY SETTING fixes the problem of no audio input. Thank you very much!