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I have read with much interest in the MMD the articles presented by
Bob Taylor and Richard Vance concerning the troubles with the old-
style pressure Aeolian 116-note players.  I am planning to build an
"orchestral" sounding residence pipe organ (I used to be an active pipe
organ builder/restorer) and since I cannot afford an original Aeolian
organ (or player console) I want to build my own player unit.

Does anyone have any data on the later vacuum-read system (such as the
vacuum level used, bleed size, and pneumatic/pouch size) used in the
non-pressure read player?  I would greatly appreciate any data of this
type.  I have scrounged a tracker bar from a junked Moller Artiste
player; the hole spacing is the same as Aeolian, except for a wider bar
that used 11.25" wide rolls.  Use of this bar would let me play 65-note
piano rolls on the lower set of holes.

Thank you, Henry Prellwitz

 [ Richard Vance just wrote a fine article on this topic, with
 [ several drawings, for the MMD Tech site.  Watch for it at
 [ http://mmd.foxtail.com/Tech/  -- Robbie