Yamaha DTXpress/DTXplorer/DTXtreme

Hi.  I just got the DTX III Special set, and the sound module seems 
to respond to all MIDI channels (playing a piano sound when my 
keyboard sends on Channel 1, for example).  Anyone know how I turn 
this off and just have it respond to Channel 10?

(BTW, I was happy to see the posts about the RHH130 not working.  I 
thought it was me!)