The Reloop Terminal Mix 4 is a 4 deck performance controller that was design for Serarto and comes with Serato DJ Intro and a 4 deck Virtual DJ Limited Edition of Reloop Edtion. I think some people confuse this controller with Serato Itch or Serato Scratch Live. However, because of the extra input lines you are able to use external programs like Scratch Live and Traktor. You would have to connect these programs as though you were hooking up to a regular mixer. It has 4-deck mapping available for Traktor PRO 2. The Reloop Terminal Mix 4 is also compatible with many different MIDI-learning software.