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 Does Analysis Lock Work in TRAKTOR PRO 2? How to Sync TRAKTOR and Ableton Live How to Import the iTunes Music Library to your TRAKTOR Track Collection