The sixth of six concerts dedicated to electronic and electroacoustic music. Six concerts where art and technique meet. A glossary of six words to orientate the listener. 6. Feedback: the return of an output signal to the input, in circular mode. Considered undesirable when it leads to the overload of an amplification system, but electric-guitar players have intentionally used it to create unique sound effects and musical sounds. Whoever has imagination does with sound what is done with pork in the best gastronomic tradition: nothing is thrown away!