Behringer XR 18 and Sonar Recording

I recently purchased and XR 18 with the idea of using it as a recording interface.  I have been able to get the USB recognized using ASIO driver.  I can see signal in Sonar and can record to a track.  The issue is I have no control over the volume slider or gain control.  Do I have to control all of that from the Xair edit software or am I missing a setting in Sonar that would allow me to set gain there?  Running Sonar Platinum.
 
Thanks,
 
Terry