If the keys do not move, I suspect you got a hold of an English-made
standard player. For some reason the English seemed to think that
seeing the keys move when a player piano plays is ill-mannered or just
not proper. So there seem to be very few, if any, English-made players
whose keys drop.
I have had some very upset customers when they learned this was the
case. In fact, I had to go in and remove most of the weights normally
found at the back end of the keys. This allowed the keys to drop and
lightened the touch. On American players the keyboards are weighted in
the front. This may be why many pianists notice the light touch found
if playing on old players, besides the fact that the old action is
loose and floppy until it is restored. That is another reason to
replace most of the piano action: to heavy-up the touch.
In fact, when regulating the front-weighted player keys to get the
capstan regulation correct, I must set a keyweight on the back end of
the key before I test for lost motion between jack and butt. Otherwise
the keyboard will have minor variations in key level, and that is after
I leveled with no action but keyweights only in place.
D.L. Bullock St. Louis