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Has anyone out there done any work on semi Duo-Arts?  That is half
a reproducing piano with only one knife valve and one accordion
pneumatic.

I am trying to restore an Aeolian Weber upright and find the
function/tubing of the "half" expression box totally mysterious.
Can anyone give some input?

Stefan Essen
Hobby restorer - Sweden
My email is essen-stefan@telia.com