To be updated, sorry.
The rig modules is where we define the rig.
The rig is defined by specifying the joints of the actuators and their specs like range.
This allows Mover to calculate the desired positions of the actuators to achieve the requested pose.
The poses are defined on the pose modules, and we can add more than one on the rig.
For example, we can have vibrations from the suspension pose, added to the pose of the motion and represent both on the rig.
This makes all the difference in Mover. Now you don't need to guess the actuator position for a specific effect. You just need to care about the pose and Mover calculates everything else.
A big advantage of this is that we know the rig pose and we can use it for motion cancellation.