I find the X-touch to be a great device with horrible documentation.  Maybe I am looking at the wrong place. 
 
There is a 1/4" jack on the back for an expression pedal.  I have an extra Mission engineering I want that to to to control guitar stuff like a wah.  Instead it is going to the master fader on the x-touch.  Nearly blew out my ears!
 
Any ideas how to route the expression pedal to different destinations than the master fader?