In a live situation, in rehearsal, by adjusting and re-adjusting the rig volumes, the tendency is to increase all rig volumes. At the end, some rigs reach maximum volume.
This requires then lowering all the volumes, rig by rig. It is a tedious operation.
A function allowing you to adjust all rig volumes in a single operation, to lower them for example, would be really useful.
And another function to adjust all rig volumes for a particular performance in one go would also be very useful.