The Traktor Kontrol S4 MK3 is a 4 channel DJ controller for advanced DJs and novice DJs who want to take it seriously. You read useful information from the 2 color screens that are processed in both decks. This allows you to see the sound waves of the music, lengths of your loops and read the beats per minute. When you want to spin with vinyl or CDs, you connect a record or CD player with the copy. By mixing music without sync button, you learn beat matching on hearing. This is a skill that is indispensable for experienced DJs. With this DJ controller the full version of Traktor Pro 3 is included. This means that you have all the functions at your disposal.