pneumatic action

music

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 2, 2026

Quick Summary

Pneumatic action is a mechanism used in pipe organs that employs compressed air and collapsible bellows to control the organ's movable parts. This system is part of the organ's "action," which connects the keys played by the organist to the pipes that produce sound.12

In a pipe organ, pneumatic action works by using air pressure to open and close the valves (mouths) of the pipes when a key is pressed or released. This allows for a more responsive and lighter touch for the organist compared to purely mechanical actions. While early organs relied on direct mechanical linkages, pneumatic systems, including tubular-pneumatic action, were developed to improve responsiveness and allow for larger, more complex instruments.32

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

4 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

keyboard instrument
Stop and key mechanisms
Organs may, however, have pneumatic, direct electric, or electropneumatic action, although these actions result in a loss of sensitivity and responsiveness. In very large organs with tracker action, considerable strength may be necessary to depress the keys. Also, where the layout of the building is inconvenient and the departments…
Read More
Organs may, however, have pneumatic, direct electric, or electropneumatic action, although these actions result in a loss of sensitivity and responsiveness. In very large organs with tracker action, considerable strength may be necessary to depress the keys. Also, where the layout of the building is inconvenient and the departments…
Read More