F.M. discovers that different sonic frequencies induce different patterns of behaviour in listeners, first in his own studio but later in the local "H-Burger" restaurant where the passive muzak appears to be wiping people's emotions.
Decoder is a 1984 West German film directed by Muscha. It is a cyberpunk and counter-cultural film loosely based on the writings of William S. Burroughs, who also acts in the film.