Thanks for your reply. That would explain why the audio recording hasn't worked w/ my computer. Cubase SL3 however seemed to work fine for audio editing, midi recording, and using rewire w/ Reason on my Intel Mac computer. My next question would be if I upgrade to CS4, would I also need to purchase another audio interface for recording, or would the MI4 interface then be compatible w/ my computer?

Thanks in advance,
Eliezer