FUTABA 16SZ Instruction Manual page 74

Function
you will find that the optimized combinations of
servo output channels and functions have been
already preset. If you would like, on the function-
setting screen of the linkage menu, you can freely
change combinations of servo output channels,
multiple servo output channels such as assigning
Function change
DG1, DG2 (switch channels)
between servo output channels and input controllers
Channel restrictions by a System Type
Operation control change
*The same control can be assigned to multiple channels.
＜ Linkage menu ＞
75