Reply to Headphone cueing: VCI-100SE + NI Audio 10

First off I wanted to just say thank in advance for any replies. I'm sure this has been addressed in the past, but I cannot find a solution and it's driving me insane.

I currently have the VCI-100 hooked up and everything is fine except I'm not sure how to configure to cue in headphones. I have the main output 1,2 going to powered monitors. How can I route the monitor output to the headphone jack on the Audio10? This is possible, correct? If not, what is the purpose of that headphone jack?

If that can't happen I need to route to another output and some type of adapter/splitter? Also, how can I control the headphone/monitor volume?

Thanks again!