I have this really nice peavy usb mixer, but when I hook it up to my mac and run it into logic, I don't have separate channels. How can I split the signal without affecting my raw recordings? Thanks in advance
yep the USB mixers and most interfaces will mix down to a stereo track. You could record two inputs and use the L and R channels on their own mono tracks but it's quite limiting.

If you want to record many tracks save up for a PreSonus FP10. They sell for around $400 new these days.