I saw a news story on a local TV station here in Seattle for this
interactive player piano.  The wind motor, however superfluous,
remains the only other visual cue that the source is indeed mechanical.
Does anyone recognize whose banks of electric valves the creator used
to make Stanley?  See http://stanleypiano.com/ and
http://mashable.com/2012/07/18/stanley-player-piano/ 

Ed Chaban