First self-taught, he discovered the catalogue of Musique Concrète with Xavier Garcia. He has built his own recording studio, and composes also in the Groupe de recherches musicales (GRM) in Paris since 1993. Lionel Marchetti also performs improvisation using microphones and loudspeakers, as a duo with Jérôme Noetinger, with the collective Le Cube with (Christophe Auger, Étienne Caire, Christophe Cardoen, Xavier Quérel, Jérôme Noetinger, Gaëlle Rouard) that performs live music and where films are shown and worked on interactively, and with the collective Archipel: Emmanuel Petit, Mathieu Werchowski, Sophie Agnel, Fabrice Charles, Pascal Battus. Since 1992, he organizes regular workshops centered on Radio and creation together with Olivier Capparos for France Culture. At the same time, he writes poetry, and develops theoretical thoughts on Musique concrète and the art of the loudspeaker.