Swell box definitions

Swell box

1) Pipe organ component
Found on https://www.crosswordclues.com/clue/swell-box

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swell box

(from the article `keyboard instrument`) ...blinds) that are connected to a pedal at the console. By opening and closing the shutters, the sound from the stops of the manual concerned is ...
Found on http://www.britannica.com/eb/a-z/s/196

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swell box

a chamber containing a set of pipes in a pipe organ or of reeds in a reed organ, and having movable slats or shutters that can be opened or closed to increase or diminish tonal volume.
Found on https://www.infoplease.com/dictionary/swell-box

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