Channel: Must correspond to the channel selected in the AS3X application in the
FM Channel Assignment screen
Switch:
Selects the switch on the transmitter that is used to select the flight modes
in the AS3X system. AS3X and Flight Mode share a switch assignment.
Assigning a switch in the AS3X menu will set the Flight Mode switch
assignment. Conversely, assigning a switch in the Flight Mode menu will
set the switch assignment in the AS3X menu.
Relative (REL) must be selected in the AS3X application gain screen to allow
adjustable gain from the transmitter.