[promixr]

@Carl- it does not have to do with how well the 'computer performs' in this case, because the Duet series is only capable of a couple of ins and outs, and both Firewire and USB have plenty enough bandwidth to handle this amount of audio I/O in a modern computing environment.

How well his computer performs is all about his computer, mainly his processor and the speed of his recording drives.

For more information on buffer sizes, etc.. check out Appendix 'A' in the Pro Tools FAQ and Troubleshooting guide. This is a pretty good explanation of what buffer sizes mean for host-based audio recording and processing.