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Diapason

The most characteristic sound produced by a pipe organ. If a pipe organ (and even some early electronic organs) could be said to have a trademark sound, this would be it and the sound would not be mistaken for any other instrument. It is best described as a pure tone with a clear fundamental and very few harmonics. Typically, the diapason pipes are made of metal, though some wooden pipes exist, and the voicing would be 8′ (though some larger organs may include additional stops of either 4′ or 16′). A diapason sound accessed by using the bass pedals typically is called Major Bass and has a 16′ or possibly 32′ length.

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