This gets to the point of the largest pipes on a pipe organ, the 32' and 64' pedal stops. There's only two "true" 64' pedal stops in the world, one of which is

This gets to the point of the largest pipes on a pipe organ, the 32' and 64' pedal stops. There's only two "true" 64' pedal stops in the world, one of which is in Atlantic City's Boardwalk Hall. You can hear it's helicopter-like sound here https://www.youtube.com/watch?v=7R2a4OxXp5A https://www.youtube.com/watch?v=7R2a4OxXp5A