I have to appologise. I´m not talking about stereo panner. I´m talking about 5.1 Surround Pan. One of the 3 choices of 5.1 panning ( Surround Pan, Surround Panner V5 and Animix Pro).
An example:
Open a 5.1 track with the “SurroundPan” ( 5.1) ". Assign it to the center and play any audio. You´ll see the center meter moving and very low, but there, left and Right meters moving. And in the final 5.1 mix the lef and Right signals are there.