Yamaha DTXpress/DTXplorer/DTXtreme

I am wondering if there is a way to assign a different midi channel 
for each pad so that I can record each pad/sound on a different track 
in Sonar? If so, can you give me guidance on how to set this up?  I 
can get all of the pads to record on one Midi track, but I would like 
a little more flexibility in mixing the drums.  Any help is 
appreciated!!

Sam