Traktor and XDJ Aero

However, in Traktor preferences, I can't seem to find "PIONEER XDJ-AERO ASIO" device. There is "Line (PIONEER XDJ-AERO)" device in Traktor Audio Setup device list, but in Output routing I see that this device has only 2 channels available.
What should I do to get 4 output channels in Traktor?