A contextual action that requests an audio mix state. When the action runs, it
writes a request into the linked
AudioDynamicMixState: the current game time and a
duration. The mix state manager then decides, on its next update, whether that state
becomes the current one. AudioDynamicMixState describes the rules.
The action does nothing and fails when MixState links no loaded object.
The client runs the action from
ordinary situations and emotes, on the unit's own data and on
GlobalContextualActionData, and from the situations
that an audio event type of the Cac family runs. A chained situation does not run it
(see IContextualAction).