Hmmm, so there's no front-end for it to assign sounds? Weird. I noticed, however, that it automatically recognizes data from a standard midi file and automatically assigns patch data. If I use the Roland Virtual Sound Canvas in it's place, I have to assign each individual sound in the VSC's front end, which is a pain, but at least I can change it to whatever sound I want using it's front-end. It'd be nice if I could get the VSC to automatically set patch data from standard midi file data. Granted, I have VST synths and such, but this is an experiment I'm trying out because a friend of mine just started using Reaper and all he has for now is the MS Synth. Thanks for your reply.