I'm trying to connect a MacBook to my 990 via USB in order to play iTunes music and I'm not having any success.

I've set USB as the audio source for Video 5, tried a couple of different USB cables, scoured iTunes Preferences, etc for for audio settings, but I don't get any audio from the 990. I've tried both USB ports on the MacBook with no success.

Anyone had success using a MacBook using iTunes as a source for the 990 via USB?