Fran, you can use the Mixing Console of course to 'change' the Drumkits to your liking, ie., Standard1 Kit to BrushKit, etc. and then save the change. So the next time you open that particular Midi file in the Tyros the new Drumkit you choose will be the one the Midi file uses when you play it. You can even change Drumkits in realtime while the Midi file is playing and it will keep using that particular Drumkit you choose until you change it again. You have to remember to 'save' the change to make it permanent.

Maybe I'm not understanding your question thoroughly Fran.