When is activateBus() called in the flow?

Is it ever going to be called while the processor is active? Or is it part of the configuration stuff, like bus arrangements?

IComponent::activateBus is called in the Setup Done state, the plug-in should be deactivated (setActive (true) not called).
Check here: VST 3 Workflow Diagrams - VST - Steinberg Developer Help

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That is a great diagram! Why hadn’t I seen that before?