F4-A4 (downtrill). 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  tr  x  | x  x  tr  Ab-tr
a-tr c#-tr

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