The web site with video is http://www.grand-pianist.com/ where you
will find specifications of the "Sega Grand Pianist" in English (well,
sort of) and you can watch a snippet of playing.  They are careful
to note that the piano playback is digital, through a single speaker,
but you can see the keys move and see someone playing notes on the
keys without the recording going.  I may be mistaken, but there seems
to be no variation in intensity as you might expect from MIDI.  Several
CDs are included including an entire disc of Mozart.

Although this is from Sega Toys, the marketing shows it in upscale
residential presentations, suggesting this is intended to please your
guests as you entertain at home.

Karl Petersen
Washington, Illinois