Yamaha DTXpress/DTXplorer/DTXtreme

I remember somebody telling me they were going to explain how to 
save different patches on the PM-16 so you could have different drum 
sounds on each patch, but they didn't have time at the moment.  I 
can't remember who that person is but I've been wondering how to do 
it.  If anyone else knows how to do it, thats cool too!  Thanks!!

-UN.H