Sonar X1 with Lexicon Omega -> Sound Problem

Hey.

I'm pretty new with Cakewalk Sonar and I have the following problem:

I don't get any sound if i try to choose one of the channels of my audio interface (Lexicon Omega) in a normal audio lane.
Midi streaming works perfectly without any latency.

I activated the Drivers in the devices manager, chose ASIO in the presets.
This problem is Sonar specific for example if I start Guitar Rig 4 solo it also works.

Has anyone ever dealt with this problem or suggestions?
I'm happy for any hint I can get.

Mfg
StealthXy