Ted,

I use a Spektrum DX7.  It has a "delta wing" configuration within.  And the manual (for the DX7) instructed exactly how to set it up.

Im at work right now and its been since mid summer since I set it up, so I dont really recall all of it at the moment.

But in short...the mixing basically separates the signal for elevator and aileron (which is what is called "elevons").

I run my radio to have the aileron function (left / right motion of the right stick) move the elevons in opposite directions to make the plane bank left or right.  Then, I have the elevator function (up /down motion of the right stick) move the elevons in the same direction to make the plane climb or dive.

Works just like any other plane when flying.