Loudspeakers; Analogue to digital converters; Audio-video receivers; Audio amplifiers; Audio interfaces; Audiovisual receivers; Cables for the transmission of sounds and images; Card reading equipment; Computer memory devices; Computer network hubs; Computer network switches; Computer terminals; Data processing equipment, namely, couplers; Digital signal processors; Downloadable music-composition software; Electrical amplifiers for use with musical instruments; Electronic switchers for audio ...