This is how I did / do it manually.
I want the export queue to do this for me.
The “adder” bus will be the master bus (main mix) sum up the tracks [if they are routet that way, which they are at an earlier or later point to be hearable on the master bus / in the final piece of sound / music / …].
Should work, right?
If I want to pick up the signals of the selected tracks at an earlier stage of the signal path (complete dry or inserts+sends…), then they still would be summarized by the master bus (main mix)[if they are routet that way, which they are at an earlier or later point to be hearable on the master bus / in the final piece of sound / music / …] - with bypassed inserts / sends, depends on where you want / choose to pick up the signal (except post fader plugins on the master e.g. for a limiter).
As I said, if this doesn’t work, suggestions how to get this work are very appreciated.