The layout of the tracker bar scale for the Aeolian Duo-Art pipe
organ player roll system is listed below.  The odd-numbered holes
are the lower row which plays the lower manual (Great) and the Pedal.
The even-numbered holes are the upper row which plays the upper manual
(Swell).

    lower row                                upper row

 1) Great Tremolo                        2) Echo
 3) Tonal                                4) Chimes
 5) Harp                                 6) Tremolo
 7) Great Extension 61 Notes,
    couples the Great up one octave.     8) Harp

 9) Pedal 2nd Octave                    10) Trumpet
11) Pedal 3rd Octave                    12) Oboe
13) Great Expression Shade #1           14) Vox Humana
15) Great Expression Shade #2           16) Diapason MF
17) Great Expression Shade #3           18) Flute 16'
19) Great Expression Shade #4           20) Flute 4'
21) Great Expression Shade #5           22) Flute P
23) Great Expression Shade #6           24) String Vibrato F
25) Pedal Bassoon 16'                   26) String F
27) Pedal String 16'                    28) String MF
29) Pedal Flute F 16'(Large Bourdon)    30) String P
31) Pedal Flute P 16'(Lieblich Bourdon) 32) String PP

Hole 33(CC) to hole 147(A) and
Hole 34(CC) to hole 148(A) are playing notes

149) String PP                          150) Swell Expression Shade #1
151) String P                           152) Swell Expression Shade #2
153) String F                           154) Swell Expression Shade #3
155) Flute P                            156) Swell Expression Shade #4
157) Flute F                            158) Swell Expression Shade #5
159) Flute 4'                           160) Swell Expression Shade #6
161) Diapason F                         162) Swell Extension 61 Notes
163) Piccolo                            164) L.C.W.
165) Clarinet                           166) L.C.W.
167) Trumpet                            168) Soft Chimes
169) Chimes Dampers Off                 170) End Of Roll. Reroll
                                             All Stops Cancelled

171) L.C.W                              172) Ventil Control
173) L.C.W.                             174) Normal
175) Ventil Control                     176) Pedal to Upper Holes

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This data compilation came from my 1926 test roll, written on it
in India ink, and verified against the list that Nelson Barden made.
It was also verified against an ancient list that was in one of my
players that no doubt came from Aeolian.  The old list was not complete
in all details but it showed the added holes for stops and expression.
It was in a very early player, about 1917.

The 1926 test roll was with the 4/56 Aeolian Kilgen that I had at
one time, and this organ did work the stops and controls precisely
as the roll indicated.  The list was triple-checked many times, as
this organ had wiring problems that I had to fix.

All these lists completely agree with each other as to stops and
expression holes, and the Pedal and Great octave coupler control
holes.  All of the five or six Duo-Art organ players I have owned
worked according to this layout.

If the organ was a small one, and used totally duplexed stops for
both Great and Swell, then the stops were parallel wired.  If the organ
was a larger model then there were appropriate ranks in each division
and they were controlled independently.

Remember, the Duo-Art player played a two-manual organ.  No matter
how big it was, there weren't separate notes for, say, a Choir
division.  If the organ was a really big one, they just paralleled
stops and sometimes just coupled divisions together for a bigger sound.
But the rolls played only three lines (divisions) of music: Great,
Swell and Pedal.  Only the Moller Artiste organ player had a separate
set of notes for the Choir.

Hole #7, Great Extension 61 Notes, doesn't transpose notes.  Some
people think it shifted the Pedal notes up one octave, but my players
just added the extra octaves.  On the player I have now, and the player
with the 4/56 Aeolian-Kilgen, it adds one octave, hole #9 adds another
octave, and hole #11 adds a third octave to the 16' octave already
playing.

On one ancient list I have, hole #11 coupled the Choir to the Great
(Accompaniment); but all the other lists say it is a third Pedal
octave.  See what I mean?  You can't always trust these lists!

Holes number 171, 173, 164 and 166 are marked "L.C.W.", and no one
knows what they do.  One good suggestion is that they were special
control holes used on the New York recording organ.

One test roll I have shows these holes marked in pencil "N.Y. Recording
Department"; when these notes were written, and by whom, I do not know,
so I cannot vouch for their accuracy.  If anyone _really_ knows what
"L.C.W." means, please let the rest of us Duo-Art organ people know.

Jim Crank