Dave Hughes Soarcerer

Sliding servo's - can be a pain to get slop-free, but sliding easily, and you can get a small c of g shift, because of the servo movement.
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In my junk-box, I have a device made either by SLEC or Micro-Mold, it's been there so long I've forgotten - but
Picture a row of three ball-joints equally spaced along a single bar.
Mount the bar crosswise on a servo disc, with the three balls facing up. The servo is fixed.
The two outer balls go to the two ailerons. The centre ball, located over the servo disc screw - therefore central - goes to the elevator servo, which is fixed.
So that - the aileron servo turns, pulling one aileron up and one down, as per normal.
BUT - the centre ball cannot move, because the elevator servo hasn't allowed it - until an elevator command is given. Then the elevator goes one way, and the centre ball, and therefore the two outer balls are pulled or pushed in opposition to the elevator movement.
The combined movements of both servos gives assymetric opposed movement to the ailerons, AND deflects them as flaps, at the same time.
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I've also seen it done another way -
picture a small rectangular frame (deliberate pun!) that is on a fixed base, but can rock fore and aft on that base.
Put a pivot bar across about half-way up the rectangle, and a pushrod mounting point on the top.
On the mid-point pivot bar, place two 180 bellcranks.
One end of each (say the bottom) of the bellcranks goes to one aileron surface
The other end (the top) goes to the aileron servo, one to each side of the disc.
The top connector on the rocking frame goes to the elevator servo.
With the rocking frame now fixed, the aileron servo drives the ailerons as normal - but reversed - by the bellcranks.
The elevator servo pulls or pushes the top of the rocking frame, the bellcranks are held fixed by the aileron servo, but because the centre pivot has now moved, BOTH ailerons deflect in the same direction - but opposite - to the elevator.
Both servos together give elevator and assymetrical aileron deflection.

The down-side of this method, it is a bit more bulky, and with extra joints, can be a bit rattly, when compared to the ball-joints method.
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You might have to draw those two out on bits of paper to 'see' how they work.
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Because the servos don't physically move, there is no c of g shift, and in the event of a crash, there is no sliding servo mass to chew up the gears on the elevator servo.

Found it!

That's an interesting piece of kit, and well made by the look of it. I am still trying to find a way to give me 3 position flaps on the ailerons of my Mpx Blizzard. -2mm, 0 and +2mm using my Horus 12S

I'm having similar problems with the S6R and the X9D plus tx.
I've got the battery cels and cel telemetry working just fine, the gyro stab on a three way (for off/bump/stabilized - for the in-flight camera) and after a lot of fiddling and suck and see, I've got the altimeter working, but can I get the vario to behave? Nah, I can get the tone to go up when the module does, but it doesn't come down again. I suspect it's reading the altimeter output, not the vario!
The very same module worked just fine on the standard rx.
But the X9D older tx won't talk to the S6 rx!
It is SOOO annoying when a manufacturer updates his kit, but doesn't let it be backward compatible and talk to earlier versions!