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A flue stop is a component of an organ that controls flue pipes, which produce sound by directing air through a narrow slit called a flue. These pipes are similar in principle to a recorder or tin whistle, with a separate pipe for each musical note. The pitch is determined by the pipe's length, and its tone quality is influenced by factors such as wind pressure, pipe material, and the shape of its mouth. Flue pipes account for about four-fifths of the stops on an average organ.12

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