If you have an older PC or laptop, I think you'll find that your earphones will play audio over USB, just the same as your Macbook.So the MacBook can output Audio to the Behringer but the 5X needs the audio fed from the Behringer via a pair of 1/4” jack leads into the audio input on the 5X.
So it has to by a 5X issue, that is it not receiving audio over USB, at least it is not on my 5X.
Yes, the problem is definitely with the Pa5X and it's the same with my Pa1000. Korg certainly dropped the ball in leaving USB audio off the specs, especially given the price of their flagship model. Maybe if they get enough complaints, they will incorporate it into the next updates but I'm not technically savvy enough to know if that can be done with new firmware.
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