C4-F4. Reid, John W. The Double Reed 4/3 (December 1981): 2.
x x x | o o o o o o | o o o Bb Bb
C4-F4. Tyree, Ronald. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 71. Also in Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 76.
x x x | o o o x o o | x x o
Heckel-System (German) Bassoon Trills and Shakes by Note Names