C#5-D5. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 29. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 178.

"Alternate trill fingers by hand. Left is down while right is up."

     Eb
tr o x | x o x Ab-tr
 c

C#5-D5. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 178.

 eb-tr Eb
x  o  o  | x o x
 c

     Eb
tr o x | tr o x
 c

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