Time for a new information
To send the air into the pipes of the organ, we need bellows. They used to be actionned by people, but nowadays, we have electric machineries for that. The bellows are still there though. They are empty, then get full of air as soon as the organ is turned on. Otherwise, you won't hear anything!
Fun fact: it takes a while to empty this bellows. This means that if the power is shut down, the sound will slowly (2 to 3 seconds) stop by being lower and lower It's interesting to hear too!
Thank you for the new information on the bellows, Melora! Fascinating
