Roon to Kii Control

I am using Roon on MacBookPro and via USB cable to Kii Control.
When I open the Roon, all is OK and I can see from the top menu where the volume sign is that the Output Device is Kii Control. As soon as I start to play music, there is actually no music and I can see that output device is set to Internal Speakers.
I have restarted the MacBook Pro, restarted the Roon only, disconnect the USB cable and connect again, disconnect the lan cable on Roon Control and connect again, no result. After start to play music, output device is set to Internal speakers!?