PowerBox MicroMatch (6800)

The MicroMatch module is a module that performs the "MicroMatch" function. It allows you to set the magnitude of the deflections and the neutral and the reverse for 2 servos controlled by one PWM signal (from one receiver channel) with an autonomous power input for servos.
It can be used, for example, in giants where 1 control surface, e.g. aileron, flap, rudder or elevator, is driven by 2 mechanically coupled servos. It can also be used as a "V cable" with the possibility of adjusting the neutrality and deflections for each mechanism separately. The module is programmable using a Bluetooth adapter from PowerBox System

And how does it work look here