Reply to Effects with Faders in Traktor

I have an X-Session Pro that I have remapped.

If I wanted to use the pitch faders, to turn on an effects unit - how would I go about mapping this?

I would keep the faders at the bottom, and when I wanted to turn on an effect, I would raise the fader (like raising volume) and once it passes a certain point, the effect comes on and now controls the dry/wet ratio. If you are familiar with the X-Session Pro, the three knobs on top of the pitch fader would then be used to control the parameters of the effect.

If anyone has any idea how to do this, your help would be so greatly appreciated!