Galen
AFR (Adjustable Function Rate) is your end point adjustment. What this means is that you can adjust the amount of travel you'll have on high rate without effecting you low rate settings, p-mixs, expos etc. like ATV (Adjustable Travel Volume) will.
AFR is what you want to always use when you need to increase or decrease the amount your surfaces will move. ONLY use (ATV) during your initial set-up in order to get both elevators, or ailerons to travel equally when using seperate channels (1+6/7 for ail. and 2+5 for Elev.) after Flaperon(FLPN)and Alavator(ALV) is activated in your Transmitter. One other thing that you need to remember. (ATV) is never linked between channels even when using the (ALV or FLPN) functions. This is so you can get your travel exactly the same from side to side. It should never be more then about a 10% difference between the channels of the surfaces you are trying to match.

Once they are moving the same amount and the centers line up, then you can go to (AFR) and add as much as you need to get the travel you are looking for on High Rate. This menu is also where you adjust the (EXPO) at for you high rates and you do this byscrolling your cursor to the NXT and selecting it.
Typically I will start around -60% on elev/ail, and -40% on rudder (MAKE SURE YOU USE NEGATIVE #'s FOR ALL EXPO AMOUNTS)

Once part is through just activate your dual rates, set the EXPO's and your about done.

Let me know if I have missed anything or you would like me to continue with something else. Sometimes its best to just put the manual aside and hook up your system so you can get a visual of what your adjusting by wacthing the servo themselves move.

Chip