This is true, but if one pays attention to the specifics of what Plato actually says and does with sound, what he consistently attempts to do is extract the
logoi from the
phone: he values the acoustic to the extent - and only to the extent - that it conforms the ideals of harmony and ideality. It's to this degree that Plato is a consummate heir of Pythagoras, who as the story goes, drowned his own student Hippasus for his discovery of irrational numbers. And like Pythagoras, Plato consistently attempts to cleanse the acoustic sphere of it's specifically sonorous, libidinal charge, in favour of it's noetic, idealizing, and discursive form. Cavarero's entire
For More Than One voice details, almost dialogue by dialogue, each of the places where Plato goes about 'devocalizing' the voice in favour of the noetic. But with respect to the flute, consider:
"Alcibiades tells the story of Marsyas, the arrogant satyr who is the protagonist of a cruel myth. Marsyas was a champion of the art of the flute, who challenged Apollo and his cithara [lute]. Marsyas was convinced that the flute produced an irresistible and extremely sweet melody that was superior to that of string instruments. But he was wrong. The myth in fact tells us that Apollo won the competition, and as punishment, Marsyas was flayed alive. His skin was torn off while his mouth, no longer intent on blowing into the flute, emitted tremendous cries of pain. Thus Marsyas learned, at great expense, that one should not challenge the gods. But he also learned that the wind instruments are a prolongation of the mouth and that they are too similar to the voice. Besides the fact that they swell the cheeks and deform the face, they require breath and thus impede the flutist from speaking. In other words, the flute lets itself, dangerously, represent the
phone in the double sense of the term: voice and sound.
Whoever plays it renounces speech and evokes a world in which the acoustic sphere and expressions of corporeality predominate. It is the world of the Dionysian dithyramb, where the flute modulates rhythms that accompany an orgiastic dance. Nothing is further from the videocentric comportment of the philosophical logos. ... Underneath Socratic speech — the very sonorous, audible speech that comes out of his mouth — there is a devocalized logos whose reality is truer, more originary, and thus, more divine. ... This order, as the harmonious, right joining of ideas that are grasped by a simultaneous vision, in fact corresponds to the
logos that is the dream [in which] there are no more flutes, nor voices, nor sounds; only a perfect noetic ecstasy."
Cavarero goes on to show how this anti-acoustic current is of a piece with Plato's dislike of Homer and poetry more generally, as well as accounting for his portrayal of woman like the Muses and the Sirens (the link between women and the acoustic is not incidental but perfectly considered): "The epic worries Plato above all for its musical and vocal performance, linked to corporeal pleasure. The harmonious voices of the Muses and Sirens, and the monotonous and penetrating song of the cicadas, continue to disturb the platonic imaginary whenever the philosopher seeks to critique the poets. The principal function of these figures — who re emblematically feminine — seems to be to emphasize the sonorous, libidinal, and presemantic materiality of logos. What is certain is that in this contagious pleasure, the acoustic register... stands in opposition to the solitary style of
theoria. This pleasure alludes to harmonious links that are different from those of the philosopher’s logos; it alludes to a closer relation, at times too close, with the female body."