I'm brand new to Logic...brand new to Mac, period. I'm getting familiar with the basics of logic express 8, however, I recently purchased a USB powered audio interface, TubeMP Pro Series by Art Audio. When I have it plugged in, the system recognizes it and so does Logic, but when it it is enabled, I hear NO SOUND!! All other audio programs play fine and I'm even able to use the interface with Garage Band to record audio, but nothing comes thru while using logic, so the interface works fine. I spoke with Apple, honestly they helped very LITTLE, so I emailed themakers of the hardware and they recommended finding a forum to figure the output situation within the program. If anyone could help solve my issues it would be greatly appreciatd!