Bass mine do, and it is noticable! When you go from one extreme to the other. It is NOT noticable when flying. I find that hard to believe that it does not have some little effect. But planes track fine in the real world.(then again I am not the best pilot) There is a thread explaining how this occurs and some very good articles on recievers, trans, etc. that are must read to understand our radios better. I have a 9zap recently bought btw.