Native Instruments announces **Traktor Pro 2.10.1 update**, a [Stems](http://www.native-instruments.com/stemsforall) focussed version that unlocks the [Kontrol S4](https://www.absolutemusic.co.uk/search.php?search_query=s4&queryFromSuggest=true&userInput=s4) for Stems, and in turn adds Stems decks to the Traktor GUI, as well as making …