Mapping main fader on guitar wing to ableton

Heyo,

So im having some trouble testing out my new guitarwing. I wanted to set it to move a whammy pedal in guitar rig from toe to heel position. I did the normal thing inside of ableton where you "configure" the plugin and choose the whammy pedal movement to make a virtual slider inside of ableton. That way i can midi map to it. When i midi map to the main touch fader on my guitar wing, something's not quite working. When i touch the fader it just goes straight up to a full toe position. and when touched again it goes back down to heel. almost just like a normal toggle button. I want to use the fader to slide up and down between heel and toe positions. 

Lil help??

Thanks!

-Aaron