I am interested in adding dual aileron servos and flaps to my Nexstar. I know I need a 6 channel RX because I currently only have the Futaba AFS 4 channel PAR-2S RX. A friend told me to make sure the RX I get is dual conversion but couldn't explain what dual conversion was and why I needed it. I was looking at the R156F receiver but it's not dual conversion. What is dual conversion and why do I need that? Also, could someone just recommend a receiver for the job? Could I go with Hitec, Tower Hobbies brand or should I stick with Futaba?