Joystick controllers are commonly used in 3D character rigging for facial animation. With this tool, you simply set five consecutive keyframes to represent your origin, right, left, top, and bottom extremes. With those layers selected, you can instantly create a joystick controller on the stage that will interpolate between those extremes appropriately.

For many characters, you may want to have replaceable parts like mouth packs for different angles. Joysticks 'n Sliders lets you create a Swap Template to help you automate the swapping of those assets according to your joystick's position.

Sliders are similar in setup to Joysticks. While sliders may feel more technical than joysticks for controlling your animation, they can be much more powerful. Unlike joysticks, there is no limit to how many poses you can create with your layers. Additionally, you can mix them together in any way you wish. This is great for rigging hands, eyes, mouths, or even a set of poses for the entire body of a character. It can even be used for motion graphics and abstract animation.

Home Page - http://aescripts.com/joystick-n-sliders/