On 02 Aug 2014, "Gene E. Bloch" wrote in
alt.comp.os.windows-8:

Have you ever heard a piano roll reproduce Glenn Gould's singing
along with his playing of The Art of the Fugue?

The piano rolls I heard didn't reproduce the players' key pressure
(I do know that other pianos and their rolls did so).

I've heard of recordings made from Gershwin's (and maybe Joplin's)
piano rolls where they play them back through a specially fitted 1st
class piano, with the dynamics added manually. I suppose the piano
rolls were captured as MIDI for playback.