Mixing decks, coloured X-ray. The two vinyl record players (left and right) are connected to the speakers (not seen) through a mixing deck (centre). The mixer allows the disk jockey (DJ) to change the speed of the turntables (circles, centre left and right), alter the sound levels and allow both records to be heard at once (mixing). The pick-up arms that contain the stylus (phonograph needle), which play the records, are on the right of each deck.