i built this:
Palate Controller—a device to translate movements of the tongue against the roof of the mouth, as in speech, into data. This can be used to make music, control the characteristics of video, etc. Objects like this device are used in speech therapy, and I heard report from a maker of retainers of this concept being used for the movement of a motorized wheelchair. Here I demonstrate its use controlling resistors which bend the reel to reel I have been playing this semester.
and here's me playing with it on Nov 28th at the Green Bicycle Organization: