https://www.facebook.com/david.evans...1191079572280/
It's not a new concept and it obviously limits the guitarists movement but does sound good.
Have a listen to Arlen Roth, he uses the volume on his Tele for swells and the tone for Wah like effects as does Redd Volkaert.
Jerry Donahue is the bend master, I'll post up some links when I jump on the PC shortly
Cool Dave never seen bends achieved this way other than pedal steel. Looks like it would take some setting up too.