F4-G4 (downtrill). Barris, Robert. (17 September 1996).

"Produces a particularly clear and in-tune trill":

F4 start:           G4-F4 trill:              
    Eb                    Eb                                 
x o x | x x o       1/2 x x | tr tr o    
                         w                

F4-G4. Christlieb, Don. Pictoral Fingerings for Bassoon. Published by author, 1966, p. 27.

 eb-tr
x o x | x x o

    Eb
o x x | tr tr o Ab

F4-G4. Lacy, Edwin V. (17 September 1996).

 eb-tr Eb
x  o  o  | x x o Ab

possible E4 end:

    Eb
x x o | x x o Ab

F4-G4 (downtrill). Savige, David. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 59. For the F4-G4 trill alternate the last two fingerings.

F4 start:       G4 trill:       F4 trill:

    Eb              Eb              Eb
x o x | x x o   o x x |x o o F  o x x | x x o

F4-G4 (downtrill). Shanker, Anthony. The Double Reed 1/2 (October 1978): 12.

F4 start:           G4-F4 trill:
    Eb                  Eb
x o x | x x o       o o x | x o tr
                           Bb

F4-G4 (downtrill). Spittel, Richard. (17 September 1996).

Start with regular F4, then G4-F4 downtrill:

      Eb         
1/2 x x | tr tr o Ab
     w

F4-G4. Timm, Everett LeRoy. The Woodwinds; Performance and Instructional Techniques. Boston: Allyn and Bacon, 1964, p. 175.

    Eb
x o x | x x o 
 a-tr

 eb-tr
x o x | x x o

"Start with forked F fingering":

    Eb
o x x | tr tr o Ab

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