Thanks Gottfried. Seems to be easy in Studio One (your screenshot), but how should this be done in Logic Pro X?
In audio settings in Logic (and OsX), I can see all the inputs and outputs, but no matter what I select for output, the master out will come out from all physical outputs (1-8+ADATs). No matter if I select the master output to 1-2, 3-4, 4-5 etc in Logic, the same output will come from outputs 1-8 which renders e.g. the use of external fx impossible. Has to be something simple as this really is a very basic feature, just cannot figure it out.
Ps. Quickly tested in Bitwig 2.4.2 on the PC, exactly the same thing, same stereo out from all outputs 1-8. Baffled.