F#2-G#2. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 19. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 171.

x x x | x x x Ab-tr
   w       F#

              F#
x x x | x x x F
   w         Ab-tr

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