This DVD explains the Traktor Kontrol S4 hardware and software.
The Traktor Kontrol S4 is a device that looks like a CD – DJ mixing deck, which, in turn, is based on a vinyl record turntable mixing deck setup.
You use the two platters to sync the tracks, and there are numerous controls to adjust the tracks during performance.
Source: DVD Kontrol S4 Tutorial DVD Part 1
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