The most simple way I can think of is using custom Boolean variables. For example:
(say the boolean is named “IsSoul?”)
Create a branch where the condition is “IsSoul?” and if its true, then makethe soul visible. If false or untrue, make it so the soul is not visible.
This should work and don’t see why it wouldn’t.
(edit: also just realised I had both boxes ticked for setting visibility - the “false” part of the branch would UNtick set visibility.)