Fonville specializes in extended techniques on the flute, especially microtonality, and performs on instruments including a complete set of quarter tone (Kingma system) flutes.
[1][2][3] He has premiered works by composers including Ben Johnston, Salvatore Martirano, Joji Yuasa, Roger Reynolds, Hiroyuki Itoh, and Paul Koonce.
[2] He is a member of the Tone Road Ramblers, the Eolus Quintet, and the UCSD Department of Music's Performance Lab.
[2] Fonville is the author of Microtonal Fingerings for Flute (1987), A Pedagogical Approach to the Flute Etudes of Joachim Andersen (1981), and "Ben Johnston's Extended Just Intonation: A Guide for Interpreters" (1991).
AllMusic's François Couture describes Fonville as, "one of the strongest contemporary flutists.