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# Factorio Prototype Docs Version 2.0.77

# VariableAmbientSoundNextStateTrigger - Prototype Docs

## VariableAmbientSoundNextStateTrigger :: union

Defines how a transition to next state is triggered.

#### Union members

`"layers-finished"` | Next state is triggered when all specified layers finish playing.
`"duration"` | Next state is triggered after a set time.

Type used in

- VariableAmbientSoundState::next_state_trigger