Hi All,  While I'm no authority on the subject of adding pipes to
an orchestrion, I know that Craig Brougher's book, The Orchestrion
Builder's Manual and Pneumatics Handbook, covers the topic in great
detail. You can purchase the book (3-Ring Binder Version) at:

  https://www.buysecure.com/playercare/reprints.html#CB-1

Musically,

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