Yamaha DTXpress/DTXplorer/DTXtreme

I have a DTXpress kit and the hi-hat controller is not working
properly.  When the hi-hat cymbal is plugged in it sounds fine.  Then
when i plug the hi-hat controller in the hi-hat cymbal sounds as if
the hi-hat controller is being pushed.  If I take the cable out for
the hi-hat controller the hi-hat cymbal sounds fine again.  I've taken
the hi-hat controller to a local drum shop where they plugged it into
an existing kit and it worked fine.  Does anyone know of a setting in
the controller that would make the hi-hat controller do this?  

Regards,

jeff