audio recorders, audio/MIDI interface units, audio interface units, MIDI interface units, sound modules for reproducing or creating sounds, [ software for use in creating sound, ] stereo mixers, video mixers, digital video workstations for editing video, digital video workstations for visual presentation playback and performance, digital graphic presenters for presentation playback and performance, [ video switchers, video cameras, video optimizers, ] and MIDI controllers

[ audio amplifiers, ] monitor speakers, audio mixers, [ echo machines, headphones, guitar amplifiers, keyboard amplifiers, microphones, graphic equalizers, sound effectors and sound controllers, ] sound generators, [ music sequencers, analog and digital recorders, blank audio and video magnetic discs, pre-recorded audio and video tapes, pre-recorded audio and video optical discs, pre-recorded audio and video magnetic discs, phonorecords, ] pre-recorded magnetic and optical tapes, cards, and d...