Very simple mapping:

It basically turns the Channel Leds for each deck in the mixer section of the Traktor Kontrol S4 in a blinking tempo indicator, so you can have a visual reference to check if your tracks are in sync.

If there isn't a song playing in a Deck, it won't display anything as usual. If there is a track playing, it will light up and start blinking in tempo.

**Note that it uses the beatgrid's information to establish the tempo of a song**