I agree with Randolph Herr about the fact the Duo-Art should not have
cut out note #4, or low "C".  This note is most necessary to play
"The Sunken Cathedral" by Debussy.  I would like to know what other
classical pieces need this note #4.  So far I have identified these
rolls:

Debussy: The Sunken Cathedral Prelude Book 1. No. 10
  69270  played by Myra Hess
  br041  played by William Murdock

Ravel: La Vallee des Cloches
  72750  played by Maurice Ravel

Liszt: Hungarian Rhapsody No. 12
  61390   played by Josef Hofmann
  6497-4  played by Percy Grainger
  6585-4  played by Alexander Siloti

I play all six rolls in a special way.  I have a Steinway AR with the
early 88-note stack.  I connect valve and pneumatic for note #4 to the
right hand turn-off hole in the tracker bar.

I repunch note #4 on each roll to be played by this hole (punched
in right place each time) and cover the wrong note hole on roll by
archival tape and powder back side so no sticking.  I then attach the
tube that went to right turn-off hole to the take up spool as some
later Duo-Art's do.

In order to stop it's turning off each time I start a roll I put
a 1927-28 Ampico single valve in series with the reconnected tube and
make this valve get air when in play.  When in reroll it is connected
and turns off roll when finished.  This is like late Ampico A's.
Then when the music calls for low C, I get it from the roll.

If one has a later Duo-Art one can construct an extra pneumatic above
the keys to play low C.  This was explained in AMICA years ago.  The
only difference is they did not explain how to change over an early
Duo-Art to play low C automatically by and with the one extra hole on
the tracker bar.  One can put a 4-way air switch in the line to play
any other of the first four notes at will but I have never done that
as low A seems the most important.

There must be many more classical selections that call for low C and
I would like a list to change over.  One would be amazed at how much
better "The Sunken Cathedral" sounds with the right note which is an
integral part of the music and quite essential.

Dean Howe