You might try posting on this Yahoo group.
http://launch.groups.yahoo.com/group/yamaha-psr-styles/

It's free to join.

You could also try posting on the PSR Tutorial Forum...

http://psrtutorial.com/ForumMain.html

Again...it's free.

Also you could try this group as well...Ron Phillipchuk's a pretty cool guy and he may be able to help.

http://www.createsongstyles.com/index.php

Good luck in your search, Yarunas.

Ian