“…ince the 1960's, audio feedback has been inventively used in experimental approaches in music creation: from the use of the Larsen effect (BONER & BONNER, 1996) by guitar players in bands such as The Beatles and The Jimmy Hendrix Experience, to the creation of analog feedback circuitry in the avant-garde/experimental art-scene, in works by Robert Ashley, John Cage, David Tudor, Gordon Muma and Alvin Lucier (HOLMES, 2008). Alongside these experimental (maybe more empirical and intuitive) approaches, a theoretically motivated use of feedback in the art of the 1960's took place under the influence of cybernetics (WIENER, 1948;ASHBY, 1956) and system theory (BERTALANFFY, 1968) -that were popular at the time, for instance in works by Nicolas Schöffer or Roland Kayn (SANFILIPPO & VALLE, 2013;PATTESON, 2012).…”