I currently have an Alesis MultiMix8 FireWire, and I am looking at replacing it with a USB 2.0 one (considering exchanging my MacBook Pro for a MacBook). I do casual recordings with my band, and we'll never have more than 4/5 inputs being recorded at once. Will USB 2.0 be sufficient for this? Recording say 4 independent channels simultaneously without any glitch? Any problems?