F3-G3. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 23. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 173.
tr tr tr | x x x
wF3-G3. Corey, Gerald. To the World's Bassoonists 5/1 (1975): 5.
o o o | o o o a-tr E-tr
F3-G3. Ewell, Terry B. (28 April 1995). Source unknown.
o o o | o o o a-tr (w-lock)
Heckel-System (German) Bassoon Trills and Shakes by Note Names