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I think what you are probably referring to are the Clarinet's sliver keys, which are located between the 2nd and 3rd fingers of the left hand and the 2nd and 3rd fingers of the right hand.

The left hand sliver key allows one to play Eb with the first two fingers pressed down (Bb second register). The right hand sliver key allows one to play B as a replacement for the right middle finger (F# second register, Eb third register).

These keys are especially useful for trilling and chromatic exercises. I have personally found that the B and F# produced by the right-hand sliver key offers superior intonation and tonality to the alternative middle finger option.

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15y ago

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