the reason I would like to keep my kn5000 is I don't want to lose the music and styles that I made.
(is there a way to convert them to a yamaha format?)

with regards to midi, if there is another way to allow the yamaha (or other keyboard) to pass through my kn5000 so that I can play both that would be my ideal situation.
(and then I can record my sounds and styles directly into yamaha?)
I will check out the links about midi...
If anyone knows the best way to link a kn5000 to something else, that is what I am after