Cannot use output 1&2 (stereo or mono) Lynx Aurora TB and Platininum

Hi all you great people:
I understand that "speakers" is the output for 1&2 in a 16 channel aurora arrangement - for Windows 10.  I see a listing for 3+4, 5+6 and so forth in the sounds under control panel in Windows.  
 
When I play from Youtube, the lynx mixer and output to 1&2 works just fine.
 
But Sonar only has output choices for 1, 2 and so forth - but not for "speakers."
 
Is there something I am doing wrong in Sonar Platinum to not get output through 1&2.  (obviously I have clicked on 1 as left, 2 as right and both together for stereo output, and none work, but once I get to 3 and above, all is good.)
 
THANKS in advance.
 
AB