I just bought PA-9 on ebay. It hasn't arrived yet. Unfortunately, Cakewalk's site for Sonar says that it is now 24/96 compatible. Does that mean that PA-9 is not, since Sonar is the upgrade to PA-9?
The most important thing is what OS you are running - they also say it doesn't run under XP. Not entirely true, it does run, but it doesn't seem to support WDM drivers which is the standard now in XP.