- The holes in a wind instrument or the key which blocks them.
- Also, the registers of an organ or the mechanism that activates them.
- A device that alters the tone color of a harpsichord or clavichord by adding or deleting strings, by the damping (or undamping) of all or selected strings.
- Modifying the pitch of a brass instrument (normally the horn) by insterting the hand into the bell.
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