I hope someone can help an old man out.
Previously my model used a 10ch 72mhz receiver. The flaps were controlled by a Y connector with a reversing circuit on the left flap. When I converted the system to 2.4ghz the right flap servo had a severe jitter. Reconnected the right flap servo without the Y and reverse circuit and now I need a program mix for the left flap servo.
I would like to create a program mix (always on) using CH6 (flap) and CH9 (aux4). CH6 should be master and CH9 slave controlled by switch SD. Switch SD uses the 3 positions to lower the flaps in two steps.

I looked in the old manual for some guidance and maybe too dumb to understand. Any help is appreciated.