Un-freakin'-believable!

You go all ballistic about USB1 or 2, which won't make the slightest bit of difference in a live situation (you've got a friggin' 80GB ATA HD, fer' Pete's sake!), but you don't ask Question #1 about which different chords the Audio loops have recorded (maj, min, dim, maj7, min(maj7), aug, 7(#9), etc.)...?

Are you a computer geek or a MUSICIAN?

My bet would be the former...
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An arranger is just a tool. What matters is what you build with it..!