Originally Posted by Razors edge 29
say you want to have an external servo for each aileron, plus use the brick for rudder and elevator.
Yes, that will work. There are two sockets for external aileron servos and the onboard ones still work as rudder and elevator. You have to switch the setting on the brick to get separate aileron servos (for flaperons). The default is that one socket is just a reversed copy of the other.