I just got a DJM250MK2, and I'm having an issue running the audio to my computer via the USB output. Everything works fine if I run it analog to a receiver via the RCA output cables. But I cannot figure out how to output the the audio from the mixer to the PC. I've updated the firmware on the device, downloaded the updated driver, and rebooted everything multiple times. When I plug the USB into the PC, I get the chime that it recognizes it. How do I play the audio on the PC? It seems like a simple fix, like a setting or something, but I cannot find anything useful in the manuals and troubleshooting resources available online.