I need help diagnosing a problem. I am using the M-Audio Onmistudio as a mixer for my synths. I have an Alesis QS7.1 and an Access Virus A. The Virus and Alesis are hooked up to the stereo inputs on the back of the Omnistudio via insert cables (Y-connector, 2 mono 0.25 inch to stereo 0.25...