Yamaha DTXpress/DTXplorer/DTXtreme

Hey guys. Ive been recording with the kit and i have to say that the 
samples I've heard on the cymbals...really stink. (sorry, but that 
how I feel)

Is there a way to make them more real sounding or is there a way 
to..IMPORT my cymbals as samples?

Thanks for the help,
Billy