Yamaha DTXpress/DTXplorer/DTXtreme

I finally got my new midi cable, the edirol is the best! Now I'm
trying to record into Cubase LE but I'm having a few difficulties
getting the right drum sounds... Cubase is triggering piano sounds,
then I changed settings and could only get the drum sounds from the
drum map on cubase. Is there an easy way to get the kit sound off the
dtxpress?

Did you try changing the drum map to GM. This should get rid of the piano sound.