That's what I used at first, but then I changed it to a pmix. Why? With the ailevator mix, you are mixing channels 2 and 8. If you move the elevators back and forth, you notice a delay between the reaction of the two servos. I decided to reduce that delay, so I created a pmix 2-5 set at 100% in each direction with the TRIM function on. I also went to the aux channel page and made channel 5 "NULL" so no knob or switch would throw the second elevator servo out of alignment. With the new 2 - 5 mixing, the delay was substantially decreased. I have since done this mixing with my IMAC planes. It does eat up one pmix but the synchronization between the servos is worth it to me.