The LiberLive C1 , or the Lava Genie is what I'm looking at. These are really cool shaped string-less guitars, which can be neatly folded:
Basically you just select the chord by touching the right position on the neck,and then trigger it using the paddle. But triggering individual 'strings' using the single-note section on the lower end of the neck seems a bit more natural to me. Which is more like the AeroBand guitar does. This a fake string section that you can actually finger like on a real guitar.
There is an open-source project at Instructables with an attempt to build something like this using an impressive number of touch sensors. But this is also meant to simulate the whole guitar, including all positions on the fret-board.
So my idea is to make the strumming part using six touch sensors which will look and feel a bit like real strings, and just select the right chord on the neck.
And, again, it looks like KontrolFreak did almost exactly that. And he is using the Teensy...