3. CONCEPTSIn this section you are briefly introduced to the main concepts of the TRAKTOR KONTROL S4 andsome basic concepts of the TRAKTOR software.3.1. S4 and TRAKTOR Control ConceptThis section quickly introduces the main areas and concepts of your TRAKTOR KONTROL S4hardware controller with reference to the TRAKTOR PRO software.S4 and TRAKTOR control concept.(1) Decks: You can use the Decks to control tracks and Samples, similar to DJ turntables or CDplayers but with additional features. TRAKTOR controls four virtual Decks and each of them canbe operated in several Deck Types: Track Deck, Remix Deck, STEM, Deck, and Live Input.TRAKTOR provides you with four virtual Decks. The two Decks on your S4 hardware controller al-low you to control the four software Decks A, B, C and D in TRAKTOR: the left Deck on your S4controls Decks A and C in the software. The right Deck on your S4 controls Decks B and D in thesoftware.(2) Mixer: You can use the Mixer to mix the audio signals coming from the Decks. The Mixer sits inthe middle of the TRAKTOR software as well as on your TRAKTOR KONTROL S4 controller. Onthe S4, the Mixer consists of the four Mixer channels A, B, C, and D which receive the individualaudio signals from the corresponding Decks. Each Mixer channel contains controls to modulatethe audio signal and to adjust the outgoing volume before the audio signal is send to the MAS-TER output. Furthermore, the Mixer provides the crossfader to let you fade between the audio sig-nals in the Mixer channels.(3) FX Units: You can further process the signals in the Mixer channels by using the two FX Unitslocated at the top-left and top-right on your S4 and in the software interface. The FX Units give youaccess to a collection of high-quality effects included in TRAKTOR. FX Unit 1 at the top-left onyour S4 controls FX Unit 1 in the software. FX Unit 2 at the top-right on your S4 control FX Unit 2in the software.Concepts4