I'm surprised nobody mentioned converting the piano to play MIDI
files.  This can be done at a cost starting around $700, if one has
an old computer laying around, going up to three thousand dollars
for a premium system.  There are thousands of piano roll MIDI files
available on the Internet.  The keys go up and down when playing,
and for realism, a loop of (non-playing) roll could rotate around
the tracker bar.

Glen Jedlicka