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Control apparatus for audio signals; Transmitters of electronic signals; Receivers of electronic signals; Electronic units for transmitting audio signals; Electronic apparatus for the remote control of signals; Multichannel sound processors; Sound processors; Integrated circuits; Audio recorders; Video recorders; Audio players; Video players; Audio discs; Video discs; Cable television receivers; Decoders; Remote control units; Remote controls; Computers; Signal processors; Audio equipment; Video devices; Audio devices and radio receivers; Multi-room audio devices; Audio apparatus; Audiovisual apparatus; Video apparatus; Amplifiers; Audio amplifiers; Audio receivers; Video receivers; Loudspeakers; Sound amplifiers; Soundbars; Digital media streaming devices; Computer hardware for routing audio, video, and digital signals; Computer hardware for signal processing of audio and video; Software to control and improve audio equipment sound quality; Software for processing images, graphics, audio, video and text; Computer software to enhance the audio-visual capabilities of multimedia applications; Computer software for controlling the operation of audio and video devices; Computer application software for streaming audio-visual media content via the internet; Multiple control signal transmission units