In the same manner as with the flute, the shape into which a player forms his or her mouth (mouthpiece (instrument) embouchure) must be used to adjust to the speed of the air stream blown into the shakuhachi.
尺八はフルートと同じく、奏者が自らの口形（マウスピース(楽器)アンブシュア）によって吹き込む空気の束を調整しなければならない。