A part of a large organ in which some of the pipes are enclosed, with a movable shutter for controlling the sound level.
- If the organ was provided with a swell box (a Spanish 17th-century invention), it would certainly be in the Brustwerk, sometimes in the Oberwerk as well.
- The organ at St. Paul's has a swell box inside the swell box, allowing greater subtlety in dynamics.
- Both the pipes and speakers are enclosed in a swell box controlled by the left-most expression pedal.
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