Hello!
I recently switched from a UR44 to a UR28m. Awhile ago on this forum, I was told that this would be possible.
The owner’s manual seems vague. I am not getting simultaneous sound out of all six outputs with a different signal. What do I do?
There are numerous posts explaining this. Use the search function 
e.g. http://www.steinberg.net/forums/viewtopic.php?f=157&t=18939&p=259234&hilit=independent#p259234