F3-Ab3. Cooper, L. Hugh. The Double Reed 1/2 (October 1978): 13.
o o o | o o o c-tr a-tr
F3-Ab3. Corey, Gerald. The Double Reed 1/2 (October 1978): 12. Start F3 with L. H. little finger whisper key [or on bassoons without this use the whisper key lock--T. B. E.], R. H. cover B and A holes, G key. Trill L. H. C# and A speaker keys, 1/2 E hole, and D and C holes together.
o o o | x x x /-tr tr tr | x x x w(lock) a-tr c#-tr w(lock)
F3-Ab3. Reid, John W. The Double Reed 4/3 (December 1981): 2. Use shake in Cooper p. 132 but add whisper key lock.
o o o | o o o o o o | o o o w(lock) c a w(lock)
F3-Ab3. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 173.
tr tr tr | x x x Ab (w) tr tr tr |tr tr tr Ab (w)
Heckel-System (German) Bassoon Trills and Shakes by Note Names