The Schulz Aria Divina was a Recordo pianos.  I have had two of them
and each one had different types of stacks.  One was typical with the
little pneumatic pouch and the other had more less regular pouches.

One of the better points about these pianos is that they play any of
the Recordo rolls.  There were three types of Recordo codings used,
and perhaps the Billings would enlighten the group on that subject.

Don Teach