It's quite possible to have instruments looking like stringed instruments, in which the note would be produced electronically according to where you placed your fingers, and where a flick of a switch would shift you to a different key, or a different instrument, like electronic keyboards - in fact I think they already exist.

But a playable instrument with real strings, tuned by little electric motors, controlled by some kind of electronic tuner - I think that's some time off, though I imagine it'd be technically possible.