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Short octave

This organ console, made in Salzburg in 1707, shows the short octave system in its keyboard permitting the range to extend down to C; see text for details.

The short octave was a method of assigning notes to keys in early keyboard instruments (harpsichord, clavichord, organ), for the purpose of giving the instrument an extended range in the bass register. A closely related system, the broken octave, added more notes by using split keys: the front part and the back part of the (visible) key controlled separate levers and hence separate notes.

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