El Capitan - M-Audio Fast Track Ultra
After upgrading to El Capitan (10.11.2), my Fast Track Ultra no longer works as an audio input/output device. Re-installing drivers does no good. btw, there were no errors during install. Fast Track Ultra has no official drivers for 10.11.x and OS X doesn't directly recognize it either. So, right now I'm stuck. The only way I can use this box (the Fast Track Ultra) is to plug it into a PC or downgrade to previous OS X.
iMac, OS X El Capitan (10.11.2)