Hi All,  The hunt for the tubing diagrams is over. Thanks to Alan
Turner, I have a wonderful set of diagrams that are extremely well
drawn.  They are in the PDF format, but Robbie said he will be putting
them and images in the PNG format into the MMD Archives (Technical
section).  I created a web page yesterday and have the files available
in PDF and JPG formats.  I also put together a couple of zip files
for easier download.

  http://www.player-care.com/half_d-a.html

Also, I received some pictures from Hans J. Schweizer of the inside
of his instrument which show the placement of the various components.
I'll put up a link on the new web page to those pictures.

Lastly, since routing the tubing in the upper section is somewhat of
a challenge, I've been taking a series of pictures as I'm dismantling
the upper section.  My aim is to attempt to remove the tubing and
associated components in a manner which appears to be similar to the
way they were installed (of course, in reverse order).  Also, since
I've received other information about how the system functions, I'll 
no doubt be adding that into the series of new web pages at some point
in time.

Many thanks to all who helped.

Musically,
John A Tuttle
Player-Care.com
Brick, NJ, USA

P.S. One thing I have learned from all of this (beyond how great the
folks in the MMDigest continue to be) is that the Half Duo-Art system
has a lot more capabilities than I imagined.  Yet, one has to wonder
why Aeolian made it in the first place, when a full reproducer isn't
all that much more complex....

 [ I suspect the Pedal Duo-Art appealed to folks who enjoyed
 [ the personal control over the performance of Themodist rolls.
 [ Watch for the schematic tubing diagrams under "Duo-Art" at
 [   http://www.mmdigest.com/Gallery/Tech/index.html
 [ -- Robbie