Bill Edgerton wrote in yesterday's MMD:

    "Back when the Pianocorder was introduced there were push-up
    players offered that used the same mechanisms that were installed
    directly in  some pianos.  Has anyone seen one of the push-up
    players offered for sale in the past couple of years, or have you
    any idea what they are worth now?"

A decade or more ago there was a digital keytop system like this
offered by QRS.  I saw a demonstration given by a representative many
years ago, when I was working as a technician for a music store.  The
system was crude at best and the expression was lousy.  It was also
available with audio accompaniment, and I remember the demonstration
including an awful rendition of "New York, New York."   I couldn't wait
until it was over!

Needless to say, the product was unsuccessful, and few were produced.
Another similar system was introduced under the Gulbransen name, but I
don't know who actually produced it.  I talked with a good friend who
works for a local dealer, and he said he would look through some old 
catalogs.  If he finds out what they were called, he will let me know.

Rob Goodale
Las Vegas, NV