Are you using the Gearbox software that came with it? It's not an option. You have to use it. Fire that up, and then see if Mixcraft receives a signal. Oh, and make sure you have all the buttons right in Gearbox (the instrument/mic button), and the knobs on the unit are turned up. It's easy to have these things set wrong. I've spent lots of time chasing down these relatively simple oversights.