TRAKTOR KONTROL S8 is designed for ultimate mixing with Stems – the open, multi-channel audio format for creative DJing. A Stem file contains a track split into four musical elements – bass, drums, vocals, and melody, for example.Transition between elements stem-by-stem instead of using global volume and EQ control for an entire track. Or apply effects just to a specific stem. And to get really creative, swap elements across multiple decks – take the vocals from one track and mix it with the beat from another.