Yamaha DTXpress/DTXplorer/DTXtreme

Hi Folks,

I've now got a fourth and fifth tom pads for my DTXpress II kit (they 
go through my Octapad II via MIDI in to the DTXpress Module).

Is there a way to edit a voice in the DTXpress Module and assign it to 
a MIDI note number?  I'd like to create a Tom 0 (higher than Tom 1) and 
Tom 4 (another floor tom) sound for the new pads.

Any advice?  Has anyone else done similar?

OGD, given the size of your drumkit (yes I have kit envy ;}) you must 
have many toms programmed!

Cheers,
Rich