---
title: rateMetaParameterDefinition
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phasegeneratornodedefinition/ratemetaparameterdefinition
---

# rateMetaParameterDefinition

A meta parameter that dynamically changes the audio’s rate.

## Declaration

```swift
var rateMetaParameterDefinition: PHASENumberMetaParameterDefinition? { get set }
```

## See Also

### Controlling Audio Playback

- [rate](phase/phasegeneratornodedefinition/rate.md)
- [gainMetaParameterDefinition](phase/phasegeneratornodedefinition/gainmetaparameterdefinition.md)