Audio? What if instead of kinect, we used a microphone? Maybe voice activated lightnings or a continuous electrical background for your phrases.

A whole new meaning for "thundering voice".

it is driven by pure sine waves -- you can't have polyphony or voice spectra (easily...)

I didn't mean to talk using the lightnings, just to make a background sound. Maybe map to the wave frequency to the speech volume or tone (harder). It would still be sine waves, but sounding slightly different based on the microphone.