F3-A3. Corey, Gerald. To the World's Bassoonists 6/1 (1976): 7. For pianissimo shake. Whisper key lock on.

F3:                 A3:
o o o | o o x Ab    x x x | x x x Ab
   w-lock           c a w-lock


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Heckel-System (German) Bassoon Trills and Shakes by Note Names