Stéphane Marchand has let me know about this paper published last year:
Anne Gabrièle Wersinger, "La philosophie entre Logique et Musique. Sextus Empiricus et la diaphônia" (Discussion de quelques arguments de Jonathan Barnes), Revue de Métaphysique et de Morale 56 (2007): 499-519.
I haven't had the time to read this article yet, so I have no opinion about its quality. You can find it here.