The Particle Photon run Arduino code that is connected to one long or a few ThinPots along the neck, and a laser/LED harp could go across the sound hole. Given the thickness of 2.5 cm (1 inch) of the pots I’m looking at making my own, I need to research, it seems like a conductor, a spacer, and a resistor layer is what you’d need. I have thin copper tape, I’d need to find the rest. Wireless MIDI is definitely possible on many platforms.
A wireless MIDI controller.