Mark Rober demonstrates an Edelweiss piano talking and playing
"Rush E" in his YouTube video: https://youtu.be/uBEL3YVzMwk 

A MIDI interface controls a bank of solenoids beneath the keyboard
of the Edelweiss piano. With fine control of the solenoids' timing and
power, the piano can selectively play notes to mimic a human voice.
A clear acrylic case reveals the action inside the upright piano.

Former NASA engineer Mark Rober builds fascinating engineering projects
for his YouTube channel. In this video, he explains the history and
engineering design of the keyboard mechanism. He also talks about the
difference between vacuum operated player pianos and modern solenoid
driven pianos.

Joel Shprentz

 [ "This piano speaks English!" Mark Rober adds, "We had to modify
 [ it so it could play "Rush E" and all the keys at once otherwise
 [ out of the box they can play about 30 keys at once." See also
 [ the video at https://www.youtube.com/watch?v=q7NuPt4pgRM 
 [
 [ The Edelweiss product line is described at
 [ https://www.worldpianonews.com/new-product/acoustic/edelweiss-pianos-2019-collection/ 
 [
 [ -- Robbie