Key Detection and Harmonic Mixing in TRAKTOR [VIDEO] About In this video we explain how to use the key detection feature for harmonic mixing in TRAKTOR. Related articles How to Set Beatgrids in TRAKTOR PRO 2 Digital DJing and Sound Quality - Handling Levels in TRAKTOR How to Sync TRAKTOR and Ableton Live How to use TRAKTOR's Step Sequencer with a TRAKTOR KONTROL S8 / D2 Controller How to Import the iTunes Music Library to your TRAKTOR Track Collection