Assign aftertouch to different paramters

I'm in SONAR X3, and ay MIDI controller has aftertouch - first time I've had such a cool feature!
But I want to rig it so that something like 'intensity', track volume or expression or something can be controller be aftertouch - but just lightly.Mostly want to use it for controlling the intensity of VST string parts.
 
Is it possible to set this up? AT counts as just another type of MIDI value, am I wrong?