Regarding the existence of playable Duo-Art organ rolls, I recently
visited "Hildene," the Robert Todd Lincoln estate in Manchester, Vt.
Not only is the home a beautiful day trip, but it also has a functioning
Aeolian pipe organ and a sizable collection of Duo-Art rolls.

No doubt many organ aficionados already know about this resource, but
some might not.  Information on the Hildene estate is available at:

    http://www.hildene.com/ 

Paul Murphy