Yamaha DTXpress/DTXplorer/DTXtreme

Hello all,

I just got my dtxpress II a few weeks ago and have run into a 
problem. I am trying to use the internal dtxpress drum sounds in 
tandem with samples triggered from my Kurzweil K2000. In voice edit 
mode I have set the TOM3 trigger to midi channel 1, which is what my 
K2000 is set to receive on. Striking TOM3 will trigger the sound on 
the K2000, but it also triggers a piano sound from the dtxpress GM 
voice list. if I set the voice select to "no assign" then no midi 
event is generated at all. I know I can totally disable the internal 
tone generator, but I still want to use the internal drum sounds. I 
tried a few vague searches in the archive but didn't come up with 
anything. Any thoughts?

Thanks