It's a piece-of-cake but I had to burn up 2 p-mixes to do it. I am using a Futaba 8uafs with an 8-channel receiver and 7 servos (one dedicated to each of the 4 aileron/flap surfaces). Off the top of my head, I think I have my flaps plugged into channel 7 and 8. I just mixed ailerons to ch 7 on one mix and ailerons to ch 8 on another. If the flap travels in the opposite direction of the aileron, reverse the direction of the flap in the p-mix screen (making percentage shown negative versus positive or vice versa). I'm still learning how to use computers radios so if something sounds funny here please chime in. Hope this helps. See ya.