Apparatus for recording, transmission or reproduction of sound; audio and video equipment, namely, multi format players comprised of CD+G, DVD±R/RW, MP3+G, MP3, MP4, CD-R/RW, VCD, SVCD and Photo CD, music mixers, video mixers, microphones, wireless microphones, amplifiers, mixing amplifiers, speakers, passive speakers, powered speakers, digital audio and video recorders, digital key controllers, signal processors, wireless audio transmitters, audio/video cables, headphones, home theater syst...