Be careful with traktor on auto mix. It has 3 rules you must follow.
1. Do not touch the faders under any circumstance. except for
2.Having one fader up full on the track you want to start with before you turn on auto mix.
3.When you turn off auto mix all faders will max out.
There are also settings such as fade in fade out time you can tinker with in settings.
I hold a huge long standing grudge with Traktor’s auto mix as it has embarrassed me on more than one occasion. It is poorly implemented, crude and unforgiving.