Malcolm,
Let's say you want ch1 as ail and ch2 as ail2.
In function ,open the function field in Ch2 and assign ail2 , Then you 'must' assign the control stick to which this responds and the trim also.
The diff,, then works on the response of these channels to the control input - the system knows you have 2 ail channels and the diff function adjusts the response - not the input .
Brian
Last edited by serious power; 04-22-2014 at 12:59 PM.