Hi I recently purchased an M-Audio Axiom 25 midi keyboard for my friend and there appears to be some kind of latency on their PC compared to my mac. I'm running it on a MacBook Pro via USB (2.16 ghz, 3GB ram, C2D model) with Logic Express - no lag. It runs on her PC desktop via USB also, 2.8GHZ Core Duo, 2GB RAM, Windows XP, using Ableton Live - it lags some times and not other times which is a little frustrating. Just wondering if this would perhaps be due to her sound card? Or use of usb as opposed to midi? Or is it the program itself and a lack of ram or something? I'll get more details off her tonight about her desktop config to help out.