Folks, I am EXTREMELY EXTREMELY and I mean EXTREMELY embarrassed to admit that I missed something big in SONAR which might have helped me on some lesser projects where I thought plug ins and convolution verbs (I'm using and LOVING ver. 5 pro), were causing dropouts. When I mentioned this TIP to a friend who actually uses the program more than I, he was not aware of it either. It IS in the manual. Yes it is, and not even in an obscure part, but I must have missed it. What is it you ask? OK, sigh. "MUTE" does not disable the audio in the audio engine. and I Repeat MUTE does not disable the audio in the audio engine. And just to clarify. Audio will still be eating up your systems resources even for muted tracks. The Solution. "ARCHIVE". Select all unused MUTED Tracks and Archive them. This takes them out of the audio engine. Nice thing is that unarchiving is very easy. This is non-desctructive. Don't mistake this with clean audio folder. Archive is an actual command within the track selection. (right click option). Freezing tracks helps a bit too. Go figure that after 14 stereo guitar takes in track panes my old Pentium IV kind of choked. With this I find my limits on an old P4 2.26 512Meg machine is about 32 tracks of 24-bit 44K audio and 1 or 2 convulution reverbs. Those verbs kill me. Workable, but I may be upgrading my core system soon. Hope this helps. Jack