Hi All,  I read, with some interest, all of the articles in the
MMD Archives that contain the word 'Half' in the Subject, and I was
sad to discover that (it seems) no one has ever drawn out a schematic
of the tubing.  In reading all of the postings, a few things are quite
clear concerning the actual functioning of the expression mechanism.

It's also pretty clear, by looking at the device, that cut-out pouch
blocks are needed for turning off the four note holes at each end of
the stack when a regular 88-note roll is being played.  It also seems
pretty apparent that the Theme and Accompaniment 'snakebite' holes are
used to direct the operation of the two flap valves in the expression
mechanism.

Basically, that leaves only the Auto Sustain and Auto Soft Pedal, which
are actually very straightforward in their operation.  Since the unit
is foot-pumped, there is no need for an Auto Shut-Off, Auto-Repeat, or
'On/Off' switch device.

However, before I sit down and try to piece together a schematic, I'll
ask if anyone already has a schematic drawing they'd be kind enough to
share with the group.  It would make a wonderful addition to the
Technical section.

Does anyone have one?  If there is a charge for it, that's perfectly
understandable.  I have no problem paying for much needed information.

By the way, I'm dismantling the upper section of a Pedal Duo-Art and
taking lots of pictures.  I will be paying special attention (when
taking pictures) to the Duo-Art switch and Pedal switch assemblies,
as these seem to be the areas when the most confusion (or lack of
information) exists.  Hopefully others may benefit from this effort
at a later date.

I've also checked the Archives using the keywords "Duo-Art" and "Pedal"
and came up with basically the same information.  Also, I did notice
many references to the PEDA (Pedal-Electric Duo-Art), but it is
(relatively) significantly different than the PDA (Pedal Duo-Art).

Musically,
John A Tuttle
Player-Care.com
Brick, New Jersey, USA
john@player-care.com