Active - toggle the Control mode.
Control - this UI is dependent on the Active state:
Active unchecked - This is the mode you set up your rig in. The five dots on the joystick represent the five keyframes necessary to set up the rig. Clicking each dot will move the timeline to the following corresponding frames:
Centre (neutral pose) - Frame 0
Left - Frame 1
Right - Frame 2
Top - Frame 3
Bottom - Frame 4
Active checked - this is the mode you use to animate your rig in. Moving the dot translates between the poses set in Inactive mode.
There's a demo scene in in the Example Files if you'd rather dive straight in.🙂