You mean you take the Front Right and copy it as a Rear Right channel ? (same with Front Left / Rear Left I guess)

Yep I get you end up creating a 4.0 (even 4.1 if your patient enough to adjust the subwoofer channel to the edit - since it’s the only channel which does not contain music alteration). Why not (not sure I must admit)… but I’ll just wait to be sure eldusto84 doesn’t have his pre-export project files anymore.

If I remember correctly DigMod you also experienced some tech issue with the bluray version of Rise of the Rebellion ?