A DJ mixer is a device that has multiple audio inputs and a single output, allowing a DJ to mix multiple sound sources into one. Mixers usually have a crossfader, equalizers, and sometimes other effects, but they do not have any built-in methods of controlling digital music files or interacting with DJ software.
A DJ controller, on the other hand, is a device that is specifically designed to work with DJ software. It has a user interface that is meant to mimic the layout of a traditional DJ mixer, but also includes various other controls such as jog wheels, fader start buttons, and transport controls (play, pause, cue). These controls send commands to the DJ software, allowing the DJ to control the software without using a mouse and keyboard. Many controllers also include an internal audio interface, which means they can be used to connect the DJ’s headphones and speakers to the computer.
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