A method and a system of organizing, arranging and rear-ranging the number and sequential order of audio effects circuit modules by the changing, including inserting, removing, exchanging and interchanging, of said modules providing noiseless, uninterrupted signal flow through a system during each of...http://www.google.fr/patents/US4479238?utm_source=gb-gplus-shareBrevet US4479238 - Audio effects system and method
