Didn't know they had added that feature, limited as it is!
And it works!! It does exactly what they claim, those that prefer mixing with faders will have them. In Sonar, a purple line will show up in console view, below the 6 onscreen faders that it can work with. The line can be moved in real time. The tracks have to be together, so one can't pick 1, 6, 9 etc and have to pick 1234 etc. It can work with automation too: just arm the tracks in the DAW, and it will record the automation and pretty accurately.