Have you ever controlled your electric guitar with your face?" asks David Merrill of MIT. "This work presents a system which uses the output from face-tracking and gesture recognition software to drive a parameterized guitar effects synthesizer in real-time."
Connecting a video camera to a face-tracking program can make for an interesting controller. The videos on this page explain it all.
Now those interesting facial contortions that guitarists often make can come to good use
Perhaps we can license this for an alternative to the mod wheel and legato pedal for GPO and JABB.