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While it's easy to begin dragging and dropping WAV files directly into the Actor-Mixer Hierarchy, when planning for a larger project you and your project would benefit from some additional thought on the matter. A simple hierarchy may consist of a single work unit that encompasses all of the game objects. Alternatively, you might choose to have a work unit for each type of sound, for example: Ambiance, Characters, Combat, UI, Voice, and so on. These work units can contain Game Objects of any type and can be further organized within folders or Actor-Mixers.