Just in case you have this problem, as I did.
After upgrading to Mojave, all seemed well until I tried to record guitar & vocals on GarageBand just as I've done for years. No matter what I tried I could not record any sound.
Finally found the fix which is here - -
https://support.apple.com/en-us/HT209175
Good luck
After upgrading to Mojave, all seemed well until I tried to record guitar & vocals on GarageBand just as I've done for years. No matter what I tried I could not record any sound.
Finally found the fix which is here - -
https://support.apple.com/en-us/HT209175
Good luck