Tim when people say "it's a Ty3 (or Ty2 with earlier models)in piano form that hasn't been strictly true. You've found the CVP won't be able to develop or use custom voices. You might find some of the functions like harmony for instance are "hidden" in menus as opposed to being immediately available as buttons as on Tyros's.
I could be wrong with the 509 but usually the CVP's only have 2 right voices as opposed to 3.
It may not be critical for you but suggest you check it out, especially the latter so at least you'll know in advance.
Otherwise best of luck with your purchase

john

[This message has been edited by jwyvern (edited 06-25-2010).]