sunk key
变暗键盘的功能 dimming functions of the keyboards
加暗加亮键控 Multiply and Screen Keys
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其二，对于自己的很多作品，巴赫本人更喜欢在击弦古钢琴而非羽管键琴上演奏，因为前者提供了更多微妙的描明摹暗的可能。
The other is that Bach, given the choices available in his time, preferred many of his pieces to be played on the clavichord with its wider possibilities of subtle shading.
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