Apparatus, instruments and systems, namely audio, video, multiplex or radio frequency generators, processors, modulators, amplifiers, monitors, controllers and test sets, for use in the fields of recording, transmission or reproduction of sound and images; for monitoring and testing, for audio and video processing, for audio and video conversion, for audio and video multiplexing, for audio and video generation and simulation, for analysis of audio and video signals, for audio and video capture, production, post-production, format conversion, mastering, copying, distribution and transmission; apparatus, instruments and systems, namely audio processors and sound enhancers, for the motion picture industry and for recording studios; apparatus, instruments and systems, namely audio processors, RDS/RBDS encoders, stereo- and surround- encoders, exciters, transmitters, receivers, controllers and test sets for television and radio broadcasting; apparatus, instruments and systems, namely audio processors and sound enhancers for live sound reinforcement and public address; apparatus, instruments and systems, namely audio processors and sound enhancers for podcasting; computer hardware and software for audio processing; parts and fittings for all the aforesaid