Register key

The register key is a key on the clarinet that is used to play in the second register; that is, it raises the pitch of most first-register notes by a twelfth (19 semitones) when pressed. It is positioned above the left thumb hole and is operated by the left thumb. The same key used in combination with the left first finger key which produces the written note A₄ (in scientific pitch notation) is used to play B♭₄. Some clarinets, particularly bass clarinets and lower, have separate keys, or a more complex key mechanism, to control two or three separate holes for playing B♭, for playing the lower notes of the second register, and for playing the upper notes of the second register.

单词	Register key
释义	Register key 原声例句 202321 In the early 8th century, Johann Christoph Denner, a German instrument maker, improved the chalumeau by adding a register key, enabling the instrument to produce higher notes. 8 世纪初，德国乐器制造商 Johann Christoph Denner 通过添加注册键改进了 chalumeau，使乐器能够发出更高的音符。英语百科 Register key The register key is a key on the clarinet that is used to play in the second register; that is, it raises the pitch of most first-register notes by a twelfth (19 semitones) when pressed. It is positioned above the left thumb hole and is operated by the left thumb. The same key used in combination with the left first finger key which produces the written note A₄ (in scientific pitch notation) is used to play B♭₄. Some clarinets, particularly bass clarinets and lower, have separate keys, or a more complex key mechanism, to control two or three separate holes for playing B♭, for playing the lower notes of the second register, and for playing the upper notes of the second register.
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