Apparatus and instruments for processing, reproducing, transmitting and recording sound or images; multi-room wireless audio servers comprising CD-R/RW drives, hard disc drives and MP3 encoders/players, wireless audio receivers comprising amplifiers and speakers, radio-broadcasting receivers, television sets, video monitors, microphones, loudspeakers, headphones, earphones, mini audio systems, audio/video amplifiers, recorders/players of optical discs, compact disc players/recorders, mini disc players/recorders, laser disc players, digital video (versatile) disc players, recorders/players of magnetic tapes, cassette tape recorders/players, digital audio tape recorders/players, video cassette recorders/players, stereo cassette decks, hard disc recorders, video projectors, audio mixers, audio signal processors, audio/video receivers, graphic equalizers, remote controllers for audio/video apparatus, electronic sound effect devices, amplifiers for musical instruments, effectors for musical instruments, MP3 encoders, MP3 players, data processing equipment and computers, personal computers and peripheral equipment, computer software, computer hardware used for computer music, computer software for encoding/playing MP3 music, computer software for generating, reproducing, effecting and recording sound, computer software and programs provided from a computer network (downloadable), sound cards, personal digital assistants (PDA), CD-R/RW drives, hard disc drives, electronic integrated circuits, large scale integration chips, semi-conductor devices, parts for all the aforesaid goods