of tracks, including phase alignment options Sampling and looping Effects (such as filter, flanger, and delay) Waveform displays for visual mixing Key detection for tracks A 4-channel mixer (one for each virtual deck) for controlling relative levels and frequencies (via multiple equalizer & filter models) Automatic gain control Real-time track management with incremental search Artwork browsing iOS and iTunes synchronization options Integrated recorder, supporting internal and external audio input Support for multiple MIDI controllers and mappings MIDI clock functionality to synchronize external hardware Support for Ableton Link, to synchronize across multiple devices Variations of Traktor Native Instruments also offers lower-priced version of the Traktor software, known as Traktor Duo. Duo features only 2 virtual decks (compared to the 4 available in the regular version), a single 3-band EQ for each channel, and six effects. The company have also released Traktor Scratch Pro and Traktor Scratch Duo, which contain the same respective features as their standalone counterparts, along with additional Digital Vinyl System (DVS) functionality, allowing control for timecoded CDs & vinyl. The entry-level version of the software is known as Traktor LE. It is sometimes bundled with third-party DJ controllers. A version of Traktor is also available for iOS smartphone & tablet devices. It is known as Traktor DJ. On August 17, 2010, Native Instruments also released Traktor Pro S4, a new version of the software specialized for their new Traktor Kontrol S4 hardware. Traktor controllers Traktor software can be controlled via hardware MIDI controllers. Native Instruments offers several controllers and mixers designed specifically for control of Traktor software: Traktor Kontrol S2 - The entry-level all-in-one Traktor Controller. A two-deck, 2-channel controller that has had MK1, MK2, and MK3 variations. Traktor Kontrol S4 - A four-deck controller that has gone through 3 variations. MK1 included cue points, plastic jog wheels, and soundcard included. MK2 upgraded to an aluminum jog wheel, and added RGB cue point buttons and a Flux Mode toggle button. MK3 added a small HD display for more information, and motorized jog wheels with haptic feedback features. Traktor Kontrol S5 - With touch strips and LCD displays similar to the Traktor Kontrol S8, but with less functionality. Traktor Kontrol S8 - The flagship touch strip Traktor controller, with LCD displays, four-deck control and on board soundcard. Traktor Kontrol F1 - A single deck controller with 16 RGB pads to access all loops and samples available on one page