Apparatus and instruments for processing, reproducing, transmitting and recording sound or images, namely, television sets; radio-broadcasting receivers; microphones; loudspeakers; woofers; sub-woofers; headphones; earphones; mini audio systems comprising amplifiers, loudspeakers; audio/video amplifiers; recorders/players of optical discs; hard disc recorders; audio mixers; audio signal processors; audio/video receivers; electronic sound effectors; computer software for controlling audio appa...