the interface isn't going to clean up anything. i'm bout to tell you how to hook up every peice of audio equipment ever made. audio out to audio in. thats it. mic into mixer, mixer into interface. if your sound sucks going into the mixer, it's gonna suck going into the interface as well, the interface doesn't have any magic pixie dust inside that's gonna magically clean up your audio. YOU have to fix your recording techniques, just running it thru an interface isn't going to help. honestly, if you could, you'd probably benefit from dumpin that behringer mixer, that probably the weakest link in your chain, depending on what kind of mic you have. but since you said the mic only fits the mixer, guess your stuck. i'd check to make sure that you don't have an input on the interface for the mic so you can skip that mixer all together, it's not needed unless you have more sources than the mic (or if your interface doesn't have an input for it). what mic do you have that "it only fits the mixer"?
LevLove
actually, i had to come back and laugh at ur post. why do you think your mic only works with the mixer and doesn't work with the fast track pro?