Yamaha DTXpress/DTXplorer/DTXtreme

I am using a DTXpress III special kit since a month and have to get 
used to the terms used in the Forums.
My problem is that when I close the Hi Hat (footCl) the bass drumm is 
triggered with it. I tried to search the Forum but could not get any 
satisfying answer on how to reduce this effect. I suppose this 
effetct is generally mentionned as crosstalk. Which parameters have 
to be changed to reduce it. I tried to feedle on all the parameters I 
thought could have to do with it without success.
Could somebody help a lost newbie. many thanks