On the Powerbox website it says that the evolution is 6 channels, and passes the servo signals directly.
But if you have two elevator servos and two aileron servos per wing (4 in total) how are you assigning the servos between the Rx and Powerbox.
Note if running directly from the receiver, it is simply a case of assigning the servo to a control, and then, in the servo setup menu, set the direction and maximum travel etc. The required control deflections, differential, mixes etc are then set up in the controls and mixer menus.
It was only when I understood this, with my old 35mhz Cockpit Sx that the Multiplex method clicked, now it seems very logical.