octave coupler

British

noun

a mechanism on an organ and on some harpsichords that enables keys or pedals an octave apart to be played simultaneously

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octave coupler

The octave coupler stop, sometimes called Harmonique, controls an arrangement whereby, when a key is depressed, its octave is made to sound also.

From Piano Tuning A Simple and Accurate Method for Amateurs by Fischer, J. Cree (Jerry Cree)

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