http://www.youtube.com/watch?v=kgnlDmVsumo (http://www.youtube.com/watch?v=kgnlDmVsumo)
This is very interesting. I wonder if it would work in the same manner as a double languid pipe??
Theres two or three drawings of interesting pipe designs in the book about the atlantic city organ. One of the designs (neither were used) used a membrane, and the other was rather strange. When i get the book back, i will see about scanning them in and uploading them here for people to see.