Freddy,

I agree with Tony. You consulted a songwriting/composition organization whose scope is copyrighted songs and music not software. If you had consulted an organization that defended software copyrights, you probably would have probably been told that you cannot freely distribute the styles which are software. Just because the software comes from the keyboard as opposed to a floppy probably doesn't change things.
Does Yamaha have the legal right to stop proliferation of their styles? Yes. Does Yamaha have the legal right to change specs without notice? Yes. Does Yamaha have the legal right to charge us for rom upgrades? Well, maybe, maybe not. One thing is clear. They have lost the good will of hundreds of customers by asserting what was legally right but morally wrong.

Larry