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A DJ controller is a piece of equipment that a DJ uses to mix and blend different tracks of music. It usually has a variety of knobs, faders, and buttons to control the volume, pitch, and other parameters of the music. Some DJ controllers also have effects and samples built in, allowing the DJ to add more variety to their mixes. The DJ controller is often connected to a computer running DJ software, which provides the music and other features for the DJ to use.