From the Bassoon-Family Fingering Companion by Terry B. Ewell - Chick, Richard. BBP2, p. 60. Cooper, L. Hugh. The Double Reed 2/3 (December 1979): 16. Peeples, Georgia. "Playing Pianissimo: Mute Fingerings for the Bassoon." NACWPI Journal 62/2 (Winter 1993-1994): 14. For pianissimo same as Cooper p. 18.