First, set up the dual rudder if you have not already. Go to an open program mix, mix rudder to the aux channel of your choice, aux 2 usually works well, and make both the percentages +100%. Then press page twice to get to the trim on/off, and make it say on below the trim. Then go to another program mix, and mix the aux channel to itself, I will assume you are using aux 2. In this case, flip the aux 2 switch all the way up or away from you. Then press Store under where it says Offset. This should bring up a value, such as +86 under the offset. Now press page to get to the switch selection, and press SEL under the switch of your choice. Now press page twice to get to the main mix screen, and enter the percentage needed with the switch in the position you want it on, I used -50. Then go to another program mix, and mix rudder to rudder. Move the rudder stick full left, and press Store under the offset. This should bring up a value such as +84. Now press page to get to the switch selection, and choose the same switch as you previously did. Then press page twice to get back to the main mix screen, and enter the same percentage value as above with the switch in the on position, only opposite, meaning + instead of -. Then go to code 17 and inhibit the aux 2 switch. Going to the servo monitor then, you can see that when you flip the switch the rudder and aux channels will move opposite of each other but move the same direction when moving the rudder stick. If the brake is moving the incorrect direction, but the rudder is correct, swap the channels that the servos are plugged into. If you have any further questions please let us know.