[alexose]

It should be possible to isolate each separate keyboard with a microphone array (but yes, signal processing...)

Which makes me wonder: With a sensitive enough microphone array, might it be possible to separate out the locations of each individual key? At the very least, it seems like it might be possible if it's coming from the right or the left side of the keyboard.

[adrianpike]

Yeah, that was the rough plan, start with a pair of mics and triangulate out - I was hoping to iterate all the way up to a pair of laser microphones on different window panes, and on paper I think it should be all doable. I'd assume all of the organizations that have budgets for things like this already have it, but it was a fun project to hack on between gigs.