I am planning on turning my powerbook into a portable recording station asap. Is it possible to run a mixer into the powerbook audio in using a 1/8 converter for the rca chord? If so, will there be any difference in quality between this and using a USB midi/audio interface with a mixer running into it? Just curious, as I am on a budget (just purchased a laptop) and running the mixer directly into the audio in would save me roughly $200 (and I would just use a simple midi interface which I already own for midi recording). thanks in advance.