F2-Ab2. Reid, John W. The Double Reed 4/3 (December 1981): 2.

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         F#-tr Ab-tr

F2-Ab2. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 171.

x x x | x x x F
   w           Ab-tr

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