Very low output on Main / Djay Pro 2 with Traktor 2 MK2 HW

I have a new Macbook pro (2018) and run MacOS Mojave 10.14.2
Djay Pro 2 (2.0.10) dedects my Traktor Audio 2 MK2, but the output level on the MAIN channel is extemly low. To low for the amplifer…
Level on headphones channel is normal.
With my old Macbook Pro (2015) and MacOS Sierra the setup worked perfectly.
Any solution to this problem?