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Manufacturer link: http://www.numark.com/mixtrack
The Numark Mixtrack is a fully compliant MIDI controller. It is interfaced with a computer through a single USB port and it does not include a sound card.
Anyone who want an affordable mixing midi controller to start with the hobby and who already has a sound card with two independent outputs (one for the headphones and one for the main output).
Anyone who want a professional grade mixing controller, or a piece of equipment combining both the mixing gear and the soundcard.