Hi All,  Concerning the current thread about the above subject, Craig
Brougher has written another insightful article about the Duo-Art
Reproducing System and "leakage".

In the article, "The Weakly-Playing Duo-Art", he explains the logic
that Aeolian employed in their design of the stack and the vacuum pump,
and some of the factors which can lead to a system that performs poorly.

The article is worthwhile reading for anyone who wants to get a better
grasp of how the Duo-Art system is suppose to function, and why so many
of them don't operate correctly.  To read the article, go to

  http://www.player-care.com/weakly-playing-duo-art.html

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