macbook air cannot connect to garageband
I have successfully installed a driver for our Yamaha THR10 amp to connect to my Macbook Pro to Garageband.
However, when I try to do the same setup for my son's Macbook Air, it doesn't work. The driver installs ok and when we connect our amp's USB cord, the computer recognizes it as a new midi connection. But, when we look for the amp in Garageband's inputs, it's not there.
So, it works on the Macbook Pro, but not the Air. Any ideas of what to troubleshoot next?