Yamaha DTXpress/DTXplorer/DTXtreme

Well I'm trying to create a kit and use my kick drum to trigger a 
bass line and I can't change the voice. I change the midi channel to 
something other than 10 but all I get is piano. When I try to select 
the midi note number all I get is a pitch change. I want to be able 
to change a note every time I hit the kick so I can create a bass 
line or trigger the line all at once with one hit of the kick. I'd 
like to be able to do the same with a cymbal for strings or guitar or 
something. Any help will be greatly appreciated. The manual seems to 
be pretty vage. By the way I'm using the DTX 2.
                          Thanks,Mike