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# Factorio Prototype Docs Version 2.0.77

# SemiPersistentWorldAmbientSoundDefinition - Prototype Docs

## SemiPersistentWorldAmbientSoundDefinition :: struct or Sound

## Properties

- default
- sorted

sound | :: Sound |
delay_mean_seconds optional | :: float |
delay_variance_seconds optional | :: float |

sound | :: Sound |
delay_mean_seconds optional | :: float |
delay_variance_seconds optional | :: float |

## Properties

### sound :: Sound

### delay_mean_seconds :: float optional

Default: `0`

### delay_variance_seconds :: float optional

Default: `0`

Type used in

- PersistentWorldAmbientSoundsDefinition::semi_persistent