By varying the shape of the oral cavity, the volume of breath and the like, the tone can be modulated so as to produce tone colors traversing harmonic structures such as soft tones, round tones, and so on.
口腔内の形状変化や流量変化等により、倍音構成はよく通る音色や丸く柔らかいものなど、適宜変化させることができる。