You don't want aileron differential, not for 3d. Flaperons is what Hitec calls it, I guess it could be called alevator- flaps mix. Check the manual for your radio. What you want is flaps (ailerons) to lower when elevator raises, and vice-versa. Gives tighter loops, quicker pitch response. It'll probably fly O.K. without it, but if the manual calls for it, I'd give it a try. You are using a computer radio, right? I would think that any computer radio would have a flaperon mix. I have the Flash 5, which is like the cheapest one, and it has it. Standard radio gear will fly a profile O.K. , but to get the most out of it, you will want the flaperons and some expo on high rates. Hope this helps.