Last year AMICA reprinted for the membership "How To Play The Pedal
Duo-Art Reproducing Piano."  On page 3 under MAKING READY number 3. it
says: 3. It is better for the instrument not have its keys dancing up
and down while you are playing music-roll. Therefore, lock the keys by
pushing the Key-locking Lever (F) to the right as far as it will go.
This lever is directly under the key-bed, usually at the right (though
in some instances at the left-hand end) of the instrument.

Neither of my Ampicos, the upright nor the baby grand, have a key-
locking device.  Do Duo-Art grands have them?  Do other Ampicos have
them?  My Gulbransen-Dickenson foot pumper does have one but would need
another layer of felt or a thicker piece to do the job right.

I find watching the keys dancing up and down to be fascinating!

Jack M. Conway, Los Angeles, California, USA