Yamaha DTXpress/DTXplorer/DTXtreme

hi guys, I have a dtxpressII and I was wondering if anyone knows 
anything about this.
Note, I have no drum training, so this is probably a technique issue..

often while listening to music, I hear the drummer sneak in a quick 
triplet on the HighHat. Kinda sounds like...
tsst...tsst...tsst...tssttssttsst...tsst...etc.  I hear it quite 
often, sometimes in guitar center, but 
never get to the drum sections in time to see it in action...:(

I assume this is done by "bouncing" the stick on the HH as it occurs 
pretty quickly.  However, when I try it
it doesn't sound quite right...I kinda bounce the stick and then 
bring it closer to the high hat to make it bouce
faster.  I'm wondering if it's a technique or/and dtxpress issue.  I 
usually do this 
with the highhats closed, maybe that is it?


Any help/advice would be appreciated.