Apparatus and instruments for viewing, recording, transmission, processing and reproduction of digital or analog, sound or images, namely, video-audio signal distributors, video-audio signal switchers and matrix switchers, video-audio enhancers,[ processors, RF processors, special effects generators,] video encoders and decoders, [electronic video signal scalers and scan converters,] video standard converters, [video time base correctors, computer genlock equipment namely, genlock systems for graphics and text overlay,] computer-controlled video equipment, namely, video matrix and processing control panels, computer interface products, namely, TTL (transistor-transistor logic) analogue encoders, TTL (transistor-transistor logic) to analogue converters, TTL (transistor-transistor logic) genlock encoder cards[, room control devices, namely, wall plates and table busses with Infra-red, Ethernet, Wi-fi and RS-232 controlling devices, audio signal defect correctors, video line amplifiers, twisted pair signal transmitters and receivers, video screen splitters and video time base signal delay correctors, blank magnetic data carriers; and blank recording discs]