Snap flaps - mix surfaces

  • Can someone explain to me exactly how I mix surfaces in RC10. I just can not manage it...
    For example, I would like to mix snap flaps (elevator + aileron).

    I use a Graupner MZ12 directly with a USB cable
    Graupner wrote to me that only the axes (similar to gamepad) are transferred but not my surfaces mixes and i have to do it in the sim directly.