Yamaha DTXpress/DTXplorer/DTXtreme

hi everybody,

this is probably easy to do. i recorded a song and saved it into one 
of the blank song spaces. i would like it so that when i press down 
on my hi-hat pedal my wonderful little song starts playing.

if someone could give me a step-by-step-push-these-buttons-in-this-
order thing that would be awesome

it would be especially awesome if i could know how to do this by 
thursday evening

thanks a lot,
dave