Using Multi-Channel Soundcard

I'm trying to set up things so I can have one stereo output for speakers and another for headphones.
I have a multi (6) channel soundcard, but although it works fine with other programs and even VirtualDJ, I can not find how to set the outputs from Cross DJ LE 2.6.0 to use 2 sets of stereo outputs.
I can select the multi channel card, but only get a "left/right" choice when I select the outputs.
If I set "Output 1" to "Left/Right" and then go to set "Output 2" the only option is "Left/Right" and that switches off/replaces the settings for "Output 1"
I've got to be missing something simple.
Any advice, please?
I have a multi (6) channel soundcard, but although it works fine with other programs and even VirtualDJ, I can not find how to set the outputs from Cross DJ LE 2.6.0 to use 2 sets of stereo outputs.
I can select the multi channel card, but only get a "left/right" choice when I select the outputs.
If I set "Output 1" to "Left/Right" and then go to set "Output 2" the only option is "Left/Right" and that switches off/replaces the settings for "Output 1"
I've got to be missing something simple.
Any advice, please?