Note 3 — VOLUME VI SLICE IV Cincinnatus to Cleruchy (continued 6)
Reading edition
Aristotle (de Audib. 802 b 18, and 804 a) and Porphyry (ed. Wallis, pp. 249 and 252) mention that if the performer presses the zeuge (mouthpiece) or the glottai (reeds) of the pipes, a sharper tone is produced.