Advanced joystick with "infinite" timelines and seamless motion

It would be a square space where you can place dots (timelines) at any location. When moving the joystick handle over the square area, it interpolates between all the timelines placed relative to their location (normalized interpolation).

It would be very useful for lipsync animation as well as making it easier to define animated behaviors that would be easily controlled via code later, like interactive character avatars.

A good example of this feature implementation is DAZ3D puppeteer animation (Video attached).