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Yes, DJs do use mixers as part of their equipment set up. Mixers are used to seamlessly blend and transition between different audio tracks during a DJ performance. They also allow the DJ to apply various effects to the sound, control the volume level of each track, and beat match the rhythm and tempo of the songs. A typical DJ setup consists of a DJ console, a pair of turntables or CDJs, and a mixer, along with other accessories like a headphone, speaker system, and sound effect controllers.