Anyone used the n-track on a lap top with an external soundcard through USB? Does this give any limitations?

I do, and it works fine. Edirol makes good ones, as to many others. It’s quiet!!!

UA5 Edirol usb soundcard was great product, i’ve one and i love it.
UA20 usb souncard .
M-audio soundcard…

i’ve got last month digidesign Mbox, she was perfect.