What version do you have? Which operating system? Right now I have 1.3.1 on a xp pro os. I use to run on win98. Does Sonar 4 run on win98 or do I have to have xp? What are the advantages of xp if any? The reason I ask is, ever since installing xp, my Roland JV-1010 no longer works for midi since there are no xp drives at the present time. I'm thinking about going back to 98, is that a bad idea? Or do I just trash my Roland and get another midi module? What would you do?????