[ S. M. Clark wrote in 060607 MMDigest:

> Why doesn't the player in my piano match any of the given
> illustrations or descriptions?  It's kind of like neither
> fish nor fowl.

Your confusion comes about because the player is not a Duo-Art.
Aeolian made many players that used the same general stack, wind 
motor, and controls.  What you have is a player that was made to
play the Themodist type rolls.

This doesn't mean that you can't play the Duo-Art rolls -- you can.
The difference being that the piano is not equipped to control the
playing volume automatically.  You have to supply this by how hard
you pump the pedals and at what position you hold the accompaniment
lever.

> Whatever are numbers 3 & 2 in the front view (page 100), they
> aren't on mine.

This illustration shows the cloth removed from the tier and you are
looking into the wood channels found behind the cloth.

> Device #11 is more elaborate than mine, which only has seven
> brass nipples (vs. 16?).

This device is just two wood blocks that are screwed together that
makes removing the action stack easier.  You just remove the six or
eight screws and the two blocks separate without removing any hoses.
Your block only has seven tubes because it doesn't have the control
hoses for the Duo-Art accordion pneumatics.  I don't recall all of the
functions passing through this block but one of them is the sustain
pedal.  The rest are used for the Theme primary box found just left
of the tracker pneumatic.

> The two black boxes below and to the right and left of the spool
> box aren't on mine.  These are probably the two accordion pneumatics.

These are not the accordion pneumatics.  These are cut-off control
blocks that switch the tracker bar tubing between 88-note and Duo-Art
mode.  There would be a switch in the spool box that would supply a
vacuum to these boxes to select the different modes if they existed.

> My tracker bar isn't as elaborate as the Duo-Art version.  It doesn't
> have the two sets of four expression holes above the main hole row
> and it is missing one or two other holes at either end.

This is the biggest clue that it is not a full Duo-Art player.  The
upper four holes that are found on the left and right of the tracker
bar would be used to control the accordion pneumatics when in Duo-Art
mode.

Pete Knobloch (Tempe, Arizona)