How do I use the USB port on my MBP for audio output

I am a fairly new commercial sound provider running live sound and the occassional itunes type playback at events.  I currently use a Y cable from the headphone output of my MBP osX  into the RCA inputs on my audio mixer.  On an older HP laptop I was able to use a USB output into the USB input of the mixer and the sound was a lot better in quality. I wish to do the same using the new MBP but when I plugged into the right side USB port I received no audio output.  What am I doing wrong?  Thanks howardfrom nh.

Have you gone into the Sound/Output system preferences to see if your mixer shows up there as a valid output device and if it does selected it there? If it doesn't appear, have you confirmed with the manufacturer of your mixer that it is compatible with Macs and if so asked if there are any drivers you need to install?
Regards.

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