Joint controllers follow the position of the limb joint, should you need something to parent knee or elbow artwork to. The Joint controller has it's own Limber Joint effect on it with four rotation options. None will make the controller always point downwards at 0º. Outwards will align the controller to the direction the joint itself points towards. With Lower will aim it towards the end controller, and With Upper will aim it directly away from the Start Controller. With Lower and With Upper rotations do not respond to Bone Curvature values, they behave as if the limb were two, straight sections.