Hi. I've got a problem with my hit hat controller with my Yamaha DTXPRESS III special. It is still opened, even if I strongly push on the pedal. But, when I half plug the jack in the hit hat controller it is still closed. I tried to change the settings for the drum kit (SP MED and not STD), I tried to change the ofset. Please, help!

pedal broken, stuck in closed position

Open pedal, check with Ohm Meter when you open/close it at the connector.
Fix.

I see pictures that show an extra device beneath the Hi-Hat and the ads mention a "stereo hi-hat controller"... on the RHH130 there is a clutch to improve the feel of the Hi Hat... I think this is what you see in some ads.

Cut and paste:

This hi-hat pad design attaches to a standard hi-hat stand. Inside of the pad is a sensor system and built-in hi-hat clutch that feels,realistic when pressed. The RHH130 also features a dual zone design consisting of pad and edge sections that offer greater dynamic realism. The pad can also produce a foot splash.

Verify that the pedal is the CORRECT type for what you are using it for.

Pedals came in MANY varieties. I would ask the store where you got the items about it.

Pedals can be switch type either normally open or closed, Variable resistance/volume control, pulse type like the kick drum pedals that generate a varying trigger pulse...

Make sure you aren't mixing up the cord for the hi hat pad and the hi hat controller.
Good luck!

try a wooden snare, a light kick drum, the most natural hi hat you can find, some soft cymbals and a selection of wooden and metal percussion instruments.

http://www.yamaha.co.jp/manual/english/result.php?div_code=emi
This should link to owners manual..Hope this helps.

youll need to change the sensitivity on the brain and all will be good

Here is a video detailing how to do this: Click Here

solution!! you go to "voice" hit the hihat pedal, then press "page" till you get to hhat ofset and bring the value to negative. approx -25. pressure that you applied to hhat pedal becomes less