Connecting tracktor scratch a10

Connecting tracktor scratch a10

I’m having a bit of a issue i have a rane 68 mixer and i just bought traktor scratch pro 2, i cant get the Master gain to run off my actual rane 68 mixer its using the master gain in traktor and i need to use the one on the actual mixer, also do u know if there is a possible way to loop roll in traktor scratch pro 2
thank you