Now, let's say you have a powerbook(and usb mouse), what do u do then ? 1. digi says the mbox has to be plugged directly into the usb port. 2. companies who make usb midi interfaces say never ever to plug the interface into a usb hub. Seems to me that the only solution is to use a hub for the midi interface & mouse. I suppose the timing on my usb midi interface(midiman 2x2) is crap anyhow, so it probably won't matter much. 