Digital Disc Jockey Interface

 Mixxx is a digital DJ system, where Wave, Ogg, FLAC and MP3 files can be
 mixed on a computer for use in live performances. Filters, crossfader, and
 speed control are provided. Mixxx can sync the 2 streams automatically, using
 an algorithm to detect the beat.
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 Mixxx works with Jack or OSS, can be controlled from the GUI or from external
 controllers, including MIDI devices and joysticks, and supports skins.