Hi, About the publications mentioned [001206 MMD, Duo-Art Reproducing 
Piano Service Manual (and related booklets)] ...

None of these publications actually mention any adjustments for the
play/no-play chord tests on the test roll.  They also do not mention
what these tests are for, nor what to do if they don't pass.

Larry Givens' 1963 book is the only publication I have seen 'til now
that mentions that these are to adjust the travel of the accordion
pneumatics.  I wonder where he got his information from?

Also, someone very recently informed me that these tests are not the
same for some different editions of the test roll.  The number of notes
that should play and not play apparently varies between test roll
versions.

If anyone has different versions of the test roll, would you be kind
enough to count the notes in these chords for us and let us know.

If they indeed vary, then these tests cannot be relevant to anything
unless Aeolian actually changed the specification of the piano at some
stage.  It would mean that one test roll's tests will pass but another
won't.  Also, then, some rolls would not be coded correctly for a
certain piano if the incorrect test roll was used to adjust it.  This
will certainly need clarification and some more discussions.

I have also recently learned that most people run these test but ignore
them if they do not pass completely.

Regards,
Bernt Damm
Cape Town

 [ The Duo-Art techs I know often ask the customer which rolls are
 [ the most played and enjoyed.  Then the tech adjusts the system
 [ for best performance while playing the customer's favorite music.
 [ Why? I believe it's because Aeolian had no standard procedure to
 [ test and adjust the pianos used by the roll editors.  The editor's
 [ job was to make the music sound nice *at the editing piano*.  It
 [ follows that, if the editing piano changed characteristics, then
 [ the customer's piano which reproduces the music must also change
 [ accordingly.  -- Robbie