Hi Stacy, I have projects where I'm using at least 7 applications of Dimension Pro plus 9 other softsynths. I too am using XP home. I Haven't had any drop outs until recently. The only thing I'm doing differently is I'm assigning effects to busses. I used to have the effects applied to the audio tracks, then freeze the track, I believe that way,the effect is also recorded to the audio track. When effects are assigned to busses, they are live effects so therefore are taking up CPU. On one project I deleted from audio tracks around 36 effects, I then froze all tracks and sent the dry audio out to the different busses. the 36 effects were replaced by 9 effects which I'd assigned to the busses. Once I done this I experienced drop out for the first time on that particular project. It maybe worth trying to have some of the effects frozen on the audio tracks. Steve W ----- Original Message ----- From: Stacy Bleeks To: ddots-l@xxxxxxxxxxxxx Sent: Thursday, August 06, 2009 3:26 AM Subject: [ddots-l] XP Home or Professional? I had a friend come around to see if he could help out with the audio drop outs/ system performance with Sonar issues. He noticed something I hadn't noticed or thought of before. It turns out I'm using XP Home edition as opposed to professional edition. Would this matter? Thanks, Stacy