Turning an acoustic piano into a high definition acoustic speaker output for any electronic waveform input.
solenoids to inductively drive steel strings
The yellow bars on the back of the piano are magnets wrapped in copper wire (solenoids). An electrical signal generated from any source can be used to mechanically drive the steel strings of the piano.
Sawtooth waveforms - which normally sound quite annoying - sound more like a pipe organ when inductively played through the piano.
Electronically triggered music played into the piano strings