Posted
[Note, these images do not reside on the CoasterBuzz server. We have removed the link at the request of Arrow Dynamics.]
Note how the outer rails control the pitch of the seats. The outer rails vary in distance from the main rails. As the the outer rails get away from the main rails, a tie rod pushes (or pulls) a lever on the seat assembly to rotate it. That means precise control over rotation.
Thanks Tornado and Millennium Force for the spots!