I'd like to answer your question, but I haven't seen one of these
turnouts yet. Even if I had, it would be hard to describe in words.
I'll try to see one at my local hobby shop the next time I go and I'll
make a drawing. Don't hold your breath waiting for the drawing. I'm
working full time and going to school at night. My weekends are taken
up studying. The drawing won't likely appear in my web page until the
end of the semester.
In the interim, I suggest the following: Draw out the turnout. Make
3 drawings; one each for the 3 routes the train can take. Label the
stock rails + and - and follow it through the turnout. By noting
which set of points was moved to change the polarity of the rails, you
will know which frog needs to be controlled by which set of points.