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This is the official HD-Video review of the Numark N4 Digital DJ Controller. The N4 can work as a standalone mixer as well as a controller or a combination of the two. The N4 comes bundled with two software to choose from (Serato DJ Intro & Virtual DJ LE) and if you upgrade the Virtual DJ Pro then you can use Timecode Vinyl or CD decks to control the 3rd and 4th decks. Check out the written review in the link at the top of the description.