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A DJ mixer is a type of audio mixing console used by disc jockeys. The key features that differentiate a DJ mixer from other types of audio mixers are the ability to redirect (cue) a non-playing source to headphones and the presence of a crossfader, which allows for an easier transition between two sources. DJ mixers are also used to create DJ mixes.
One of the pioneers of DJ mixing equipment design was Rudy Bozak.
Beatmatching and beatmixing with a DJ mixer were first used to ensure dancers didn't leave the dancefloor between songs.
More recently DJ mixers have been used to for harmonic mixing.