Hi
Actually this is NOT true - the Drums/Rhythm are limited to Performance PART 10 but you can change the Part MIDI Channel to anything you want between 1 and 16.
In Performance Mode, change the Part Midi Channel value.
You are limited to only 1 Drum/Rhythm Part unless you have an Expansion Board that supports Percussion Menu Patches, which can be assigned to any Part.

* Roland & Cakewalk Resources and Roland Newsgroups: http://www.lilchips.com *