Thanks for the help Wookiee; I'm been using a combination -- since everything is output from sample libraries, it depends on the library. Where possible I route similar sounds to an aux bus with a single reverb; for some libraries there is already enough reverb in the sounds produced; for others I use per-track. On this one, two musical lines, twelve midi tracks, three libraries -- the Berlin Strings and Vienna Chamber Strings are both pretty dry so they went together into a Virtual soundstage reverb and placement, while the solo strings, dry originally, I had modified to use a Kontakt 'concert hall' convolution reverb, so the four tracks with that library went only to the sonar "Channel Tools" plug in for some shifting of the stereo. You'd think I'd be better at this having done it so long, but I'm probably hampered by my 'studio' being just a messy room with a couple of good speakers perched on boxes behind my big computer monitors.