C4. Corey, Gerald E. "How to Improve Your Tuning on the Bassoon." The Journal of the International Double Reed Society 8 (1980): 32.
"In extreme situations, half open the low C# key to raise the pitch."
Db--half open x x x | o o o
C4. Davies, Mark. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 55.
Db x x x | o o o
C4. Peeples, Georgia. "Playing Pianissimo: Mute Fingerings for the Bassoon." NACWPI Journal 62/2 (Winter 1993-1994): 15
F#
x x o | x x x F
BbC4. Polonchak, Richard M. "What Directors Should Know about Bassoonist in the Band." The Instrumentalist 30/9 (April 1976): 26. Use Cooper p. 163 but hold down the L. H. Eb or Db keys half-way for a slow solo passage.
Eb or Db x x x | o o o c
C4. Swanson, Robert. "Pictorial Bassoon Fingerings." Woodwind Magazine 4/1 (September 1951): 9.
Eb x x x | o o o c Bb
C4. Tilson, Lawrence. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 56. Same as Copper p. 162 except gradually close R. H. B hole for diminuendo to pppp.
x x x |(x)o o