Loudspeakers; Analogue to digital converters; Audio-receivers and video-receivers; Audio amplifiers; Audio interfaces; Audiovisual receivers; Card reading equipment; Computer network hubs; Computer network switches; Computer terminals; Data processing equipment, namely, couplers; Data synchronization cables; Downloadable music-composition software; Electrical amplifiers for use with musical instruments; Interfaces for computers; Portable media players; Signal processors for audio speakers; So...