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# metaParameters

The object’s meta parameters.

```
var metaParameters: [String : PHASEMetaParameter] { get }
```

## Discussion

Each meta parameter contained in this dictionary affects only the sound event instance when you change the parameter’s value at runtime. As a read-only dictionary, the framework sets the contents based on the parameter you pass into a node definition initializer, for example, [`init(switchMetaParameterDefinition:)`](/documentation/PHASE/PHASESwitchNodeDefinition/init(switchMetaParameterDefinition:)). The dictionary key is the [`identifier`](/documentation/PHASE/PHASEMetaParameter/identifier) of the source [`PHASEMetaParameterDefinition`](/documentation/PHASE/PHASEMetaParameterDefinition).

> Tip:
> To propagate a metaparameter change to multiple sound events instead of just one, register the metaparameter globally by calling ``doc://com.apple.phase/documentation/PHASE/PHASEAssetRegistry/registerGlobalMetaParameter(metaParameterDefinition:)``. To change its value, access the metaparameter through the asset registry’s ``doc://com.apple.phase/documentation/PHASE/PHASEAssetRegistry/globalMetaParameters`` dictionary instead.

---

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