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# Factorio Prototype Docs Version 2.0.7

## PersistentWorldAmbientSoundsDefinitionCrossfade :: struct

Inherits from Fade « Attenuation

## Properties

- default
- sorted

order | :: {`"wind"` or `"base_ambience"`, `"wind"` or `"base_ambience"`} |

Inherited from Fade

from optional | :: ControlPoint |
to optional | :: ControlPoint |

Inherited from Attenuation

curve_type | :: AttenuationType |
tuning_parameter optional | :: float |

order | :: {`"wind"` or `"base_ambience"`, `"wind"` or `"base_ambience"`} |

Inherited from Fade

from optional | :: ControlPoint |
to optional | :: ControlPoint |

Inherited from Attenuation

curve_type | :: AttenuationType |
tuning_parameter optional | :: float |

## Properties

### order :: {`"wind"` or `"base_ambience"`, `"wind"` or `"base_ambience"`}

Type used in

- PersistentWorldAmbientSoundsDefinition::crossfade