
I've just invented a new musical instrument in my BRAIN. (Well, more, an interface. But.) All I need is a large multitouch screen and an SDK. IGOR! BRING TO ME $10,000!
No? Foo.
Hm. Okay, I just need cheaper ways to do it. What does fibreoptic cost in bulk these days? It's gotta be cheap, right? Sensors are gonna be spendy tho'. On the other hand, that could be crazy kinds of analogue, which has its good points. And wouldn't be as mobile, no flick thing. I want that flick thing. Foo.
Okay, really, it's very simple. So if you took a piano keyboard and warped it into an arc, yes? And made it flat and touch sensitive (see above, multitouch screen), and tone-wrapping rather than tonally fixed by position of finger on key, but with a kind of snap-to-centre functionality (over position... and time? That should be a setting) so it doesn't turn into a Theremin. Then add the ability to flick the "keyboard" so that it'd move underneath your fingers, without having to lift your fingers. And you could have volume by area-of-touch as an option, and lockdown and snapto positional points and things like that. (eta: note that the "keyboard" is the "playtable" and part of the multitouch screen, not a separate keyboard or keyboard-like device.)
The base sound would be synth, of course. You could have waveform editing on the fly by drawing them on other parts of the touchscreen. And you could have a bunch of saved FM waveforms, and drag and stretch them over parts of the playsurface, with all kinds of combinatory options. (TBD: if you flick, does the affected region stay associated with screenspace or with virtual playtable space?) And you could do sampled noises as well, of course. Modified, maybe, by the FM waveforms as overlays. The permutations are of course obvious. You could have pedals as options switches, for likes like "combine" and "multiply" and "subtract" and "sustain" or "extend" and and and.
For maximum operatic effect, allow dragable/applyable stage effects controllers.
eta a few minutes later: force-feedback (rumble) gloves are an option for tactile response.