I have installed JR DS821 servos on each elevator and aileron. The ailerons use 2 channels through the JR Flaperon system. The elevators are also on seperate channels using elev. and aux2. A real PITA to set up but when you get it right the elevators are together perfectly from full down to full up. The only way I found to de-activate the "aux 2" switch is to use the travel adjust page and set the max travel to 0% up ad 0% down.My new Extra 330 weighs 7lb. 13oz. ready to fly with no fuel. Maiden flight will be next week or as soon as the weather gives us a break.