I am asking this to satisfy my own curiosity.  The piano is rebuilt,
delivered, and paid for, and the customer is happy with it the way
it is.

This is a normal Cable 88-note upright player piano, _except_ that
it has extras I have not seen before.

  (1) There is a slider on the bottom board that, when slid toward the
treble, opens the pedal door by means of a roller and levers, lowers the
pedals by means of a rack and pinion gear set and levers, and pushes
out the center of the key strip to reveal the controls by means of a
rack and pinion gear set and levers.  When slid back it raises the
pedals and shuts the door.

  (2) There is a bellows and valve against the inside of the treble end
board at the bottom that activated a push rod that went up almost to
the top of the piano and a couple of brackets on the inside of the ends
at the top.

  (3) The tracker bar had the normal 88 square holes although they were
somewhat smaller than normal, but there were long narrow vertical slits
above and spaced between the tracker bar holes.  These slits were tubed
so that each set of 2 adjoining slits fed 1 tracker bar nipple.  This
gave 132 tracker bar nipples in the note area.  There was a extra hole
to the right of note 88 (similar to the sustaining hole left of note 1)

  (4) Inside the bottom board there were 2 cardboard sheets of
instructions to the tuner.

From here on I am guessing since the following parts were not there.

There was a set of 44 valves and pneumatics with appropriate levers
that hung near the top of the piano and when triggered by the slits
in the tracker bar would move the hammers on 2 notes forward to soften
those particular notes.  This whole assembly was pivoted on the 2
brackets by means of the bellows and push rod in the bottom of the
piano to turn it off and on.

The rolls were cut with holes of 2 different widths; the narrow holes
just playing the notes and the wide holes uncovering the appropriate
slits and playing those notes softly.  I have never seen any rolls
like this and have never seen this reproducing(??) type of action.
Has anyone had any experience with this?  Are my guesses right?
I would appreciate any further information about this unit.

This was called a "Solo-Carola Inner-Player" in one place and a
"P. G. Carola Inner-Player" in another place.  I did photo copy
the sheets inside the bottom door but since the paper was very brown
they are somewhat hard to read.

John Dewey