My 2011 macbook air has Yosemite on it. Turn the selector knob on the dac full counter clockwise. Open "sound" in the mac preferences and select the audio-gd, open the audio midi set up, and select the dac. It should work. Mine works a champ. Mine does have the older USB-32, but it shouldn't make any difference. Good luck! Edit - congrats on a sweet dac!
5/29/16 at 6:05pm