The USB is a slave port. You need a USB master to drive the adaptor and the empeg doesn't have one and won't have one. The empeg folks said that a) they don't have room, b) that 99.9% of the people need a slave device so they can hook it up to their home PC for downloads (and a master can't talk to a master without special additional hardware), and c) that USB master chips usually come attached to a PCI bus - which the empeg doesn't have.
Cheers,
=-C
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List 351, empeg 00045, 10gb, Amber
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Queue 351,
Mk I, 30GB
Mk II #60000022 80gb, Blue - docked
Mk2a, 80GB, Bruface, lighted buttons and dial