The total signal reaching the main mix through every subgroup: each group's bus level, scaled by its group→main send, all summed. Groups that don't feed main contribute nothing.
the subgroups
a channel's post-fader signal (linear)
the summed main contribution from all subgroups
The total signal reaching the main mix through every subgroup: each group's bus level, scaled by its group→main send, all summed. Groups that don't feed main contribute nothing.