Hi Guys, I don't suppose anybody could explain the inherent differences between USB 2.0 and Firewire external Audio interfaces, and how this influences their performance? I've got a fair grasp of why FW 800 or even 400 is generally prefered over USB 2.0 for recording directly to an external HD, but I can't find anything on the differences in relation to external audio interfaces. I'm in the process of deciding what type interface to buy, and can't make my mind up. P.S. I assume the differences relating to performance are negligible.