digital sound equipment and media, namely compact disks prerecorded with music or video sound tracks; compact disk recorders; compact disk players; digital audio tapes prerecorded with music; digital audio tape recorders; digital audio tape players; digital video disks prerecorded with music and video sound tracks; digital video disk recorders; digital video disk players; satellite digital audio transmitters; satellite digital audio receivers; cable digital audio receivers; cable digital audio transmitters; digital audio workstations, namely, digital audio encoders, digital audio decoders and drives for digital audio media; digital sound, video and background audio systems, namely, combinations of (1) compact disk player, digital audio tape player, digital video disk player, laser disk player, radio receiver, television receiver, cable video receiver, satellite video receiver, digital compact cassette player, mini disk player, digital video tape precorded with music or video sound tracks, computer hard disk or video projector, (2) pre-amplifier, audio/video receiver, digital audio decoder, digital audio processor or sound effects processor, (3) audio equalizer, (4) audio amplifier and (5) audio speakers; digital compact cassettes prerecorded with music; digital audio recording systems, namely, combinations of (1) compact disk recorder, digital audio tape recorder, digital video disk recorder, digital compact disk recorder, digital multi-track audio recorder, hard disk recorder for computers or mini disk recorder, (2) microphone, (3) microphone amplifier, (4) analog-to-digital converter and (5) bit-rate reduction encoder; digital audio mixing systems, namely computer-based hard disk audio editors and mixers, digital audio mixing consoles; digital audio processors; audio broadcast transmitters; audio broadcast receivers