On my g4 400mhz I feel often that the firewire is kind of slow. So I upgraded the internal drive with an IBM drive that is 40 gigs and spins at 5600 rpm. That being said I could still do 24 tracks of audio in logic 4.7 in OS9 if I enabled some switches in my USB driver. This with an emagic 2 I 6 interface. Plugins as well.