Yamaha DTXpress/DTXplorer/DTXtreme

Hi, I've got a question about adding extra pads to the DTXpress. I'm 
not sure if I am misunderstanding this, but is it possible to run two 
pads into one input ie tom and cymbal, by using a 2x mono to 1x 
stereo plug, and for each to trigger a different sound? Any help 
would be appreciated! Thanks, Mike Bowden