Futaba 10J - Manual (Page 56)

Auxiliary channel function (AUX-CH): defines
the relationship between the transmitter controls
and the receiver output for channels 5-10.
Remember that if you assign primary control of
a channel to a switch which you later use for other
functions (like dual/triple rates or airbrakes), every
time you use that other function you will also be
moving the auxiliary channel.
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