I thought people had done it successfully as long as they used ethernet to connect to the empeg. At least that's my fuzzy memory on the topic, I could be wrong. In any case, I wouldn't necessarily expect USB to work.

Other notes: 1. Any specific reason you're not just using Jemplode? 2. More specific details about what exactly isn't working, what you have tried to do to make it work, etc., might help us respond more accurately.