Well, that raises an interesting question. The only plane I've mixed this year is the Accel Katana profile, which I'm still in the early stages with, and I have rudder to down elevator, 9 & 10%, or 10 & 11%, something like that, at the moment. What is interesting is that when I fly an unmixed model, I just about always have to touch in up elevator for level turn with the rudder. But when I mix for neutral pitch on knife-edge, the unmixed model pitches to the canopy, so I mix in down elevator. What I'm after here is a four-point roll that stays on track with elevator only on the upright and inverted points, and rudder only on the knife-edge points. When the wind is blowing, 95% of the time, tracking is always a hassle.

Then once my model is mixed as well as I can get it, from that point on I tend to forget about the mixes (they're always on null switch position) and fly the sticks on everything--because you always have wind and turbulence and whatnot complicating the situation, so I just fly what I'm seeing whereas in the mixing process I tend to look/think/mix/repeat... but after mixing is done, I stop thinking and just fly.

Rudder to aileron is typically to fix an adverse roll, so you mix same aileron to rudder; but if it's a proverse problem, obviously you mix opposite aileron. Mostly a matter of low wing or mid-wing and not enough dihedral.

When I speak of starting a mix at some level-- I don't do any mixing at all for maiden and early flights. I just fly and trim and try my usual tricks without thinking about mixing. But pretty soon the problems start to make themselves clear, and that's when I start making notes and begin the trial and error of mixing. I've heard war stories about Jason and other guys mixing in the air, punching buttons with the TX held up for simultaneous view of plane and TX display, getting everything dialed in in one flight. I'll never be in that class. I mix by flying, landing, mixing with the model idling in front of me, taking off for another trial, another error, etc.

I'm on a new transmitter this season, and all my old mixes got sold with the old one--otherwise I'd have a look and see how I had them set up. As I re-commission my old models here in the new season, I'll mix them all over again.

I do remember now a CAP that did have rudder to up elevator. But most others, my impression is the mix was rudder to down elevator. In any event, there's no room for arbitrary thinking here, you have to fly the model to see what it needs for mixing.