The way I would suggest saving the Roland styles is to change them in the Style Recorder then save them to a new style.
This way you wouldn't have to have Reg. banks for them.
It's pretty easy, just select a style like you were going to play it, change all the volumes or voices or whatever, then push Digital Recording, then Style, and save it. I haven't done this on the 2000, but it was very simple to do on the 9000.
Let me know how it works!
DonM