I was having issues getting multiple tracks to record simultaneously. Sonar was only recognizing a single stereo track. I read the manual, installed the drivers off the disk (ooops!) and could not get it to work. I called Mackie tech support. Wow! The guy I got was super awesome. He stayed with me through reboots and downloads, got me up and running and then helped me make sure that Sonar saw everything correctly. It was a rare event these days where you get someone who really wants to help. It was great!
Mackie Tech Support