In OMB ver 10 I use the sfz to load one at a time. But after reading some of your old posts I only use one.
Actually, for me, the microsoft wavetable synth sounds pretty good, at least for bass and drums. There are some solo voices that aren't that great but overall I'd rather play than bother with editing voices and midi.
I've been doing midi since before the beginning of the gm standard, used sound modules in those days. So I understand a little about this midi stuff I just don't want to fool with it anymore.

I loaded the sonar just to see how to work with the dxi and stuff, but I'm gonna dump it. I've been using powertracks pro for years and I'm used to that. I had to read the help file to find out how to change an instrument in midi track. To me a basic function like that should pop right out and hit you in the face you shouldn't have to go looking for it. It might be a nice program, but again, probably way more than I'm looking for or will ever use and a big learning curve.