Ab3-Bb3. Corey, Gerald. "How to Make the French Bassoon `Work.'" The Journal of the International Double Reed Society 1 (May 1973): 38.

Ab3:                  Bb3:
/ x x | x x x Ab      / x x | x o x Ab
   Eb                    Eb    E
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Buffet-system (French) bassoon trills and shakes by note names