Whatever I do, I don’t get any mirrored main outs signal on my alt outs. I choose in the config screen MainLR L and MainLR R, that should do it, isn’t it. There is defenitely a signal on the main outs! BTW also not when I choose another output for mirroring. Can it be it is because I don’t use a balanced connetor to output?
My first thought was: Wow - an “AI Out”!
But then I saw what you meant. ))
You could easily test your Alt Outs by plugging headphones into them.
You should hear something like a wide differential signal from one of your two channels L or R.
If that’s the case, the output is working correctly balanced, but you should still get a signal even with an unbalanced cable.
However, if the signal is localized in the center of your head, like a normal mono signal, or you only hear one side of the headphones, or nothing at all (which I doubt), then … we’ll see.