D4-F#4. Kubey, Arthur. In Klimko, Ronald. Bassoon Performance Practices and Teaching in the United States and Canada. Idaho: University of Idaho, 1974, p. 67.

tr tr o | o o x F
                Ab

D4-F#4. Rechtman, Mordechai. To the World's Bassoonists 4/2 (1974[75]): 4.

tr tr o | o o x Ab
             F#

D4-F#4. Reid, John W. The Double Reed 4/3 (December 1981): 2. Same as Cooper p. 180.

x x o | o o o         o o o | o x o

D4-F#4. 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. 75.

tr tr o | o o x F
Bb (B C)        Ab

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