LSJἰσο-τονίαGlossuniformity of pitch, level pitchἰσο-τονία,ἡ, in Music,A. uniformity of pitch, level pitch, Ptol. Harm. 1.4 (pl.), Porph. in Harm. p.287 W.ReferencesPtol. Harm. 1.4Porph. in Harm. p.287