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Normally the PX21 has a little plastic box that connects the USB portion and the Audio jack, the solution is to very carefully cut that box off and lengthen the cables yourself, very simple to do.
After you get that portion done, just change your audio settings and you're good to go

I hope I helped you guys out a little
Sorry guys, images are too large to upload for some reason, im sure you can easily figure this out without them though.