A4-C4. Wirt, Ronald. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 72. Trill L. H. c speaker key with the right hand.

       Eb
x  x  x  | o o o
c-tr a c#

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