Hello CeDoMain,
I don’t know if I understood you right:
In general there are some options how you can configure the “main-bus” for your show.
There is 2 Mono (then they will be named “Main 1” and “Main 2” which is L/R or you can combine them. Also you can have a LCR Master, then you’ll have L/R as “Main” and C as “Main”, but L/R will be labeled with ST.
But you always can change the names.
And there is no “true” main it simply depends how you configured your show.
Cheers