The gizmo key is a key commonly found on the B foot joint of certain models of flute. It closes the low B tone hole without closing the low C tone hole or the low C tone hole, which is intended to facilitate the performance of the fourth octave C.

Parts of a flute. The gizmo key is illustrated in red.

The gizmo key was introduced by Verne Q. Powell (Powell Flutes), in response to criticisms of the B foot joint by performers such as Jean-Pierre Rampal, who believed that the lengthened tube made it harder for them to produce the highest notes. It is now common on the instrument.

Further reading

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  • Nancy Toff, The Flute Book (Charles Scribner's Sons, 1985). The Development of the Modern Flute, pp. 23-24