Well, Standard Midi Files are incredible! The GM voices somehow seem better than the presets! Must be user-error!

Also, I altered all of the volumes and arranger parts and now this thing rocks.

Very pleased with it!

(I must say that my wife walked in, listened to it for about 2 minutes and said that this arranger is typically me - anything to get out of joining a band and actually having to deal with people. Precisely!)