---
title: speed
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/audiomixgroup/speed
---

# speed

The rate of playback for an audio mix group.

## Declaration

```swift
var speed: Double
```

## Discussion

Discussion The system limits the rate of playback to the range of [0.25, 4]. The default speed is 1, which is equivalent to a normal playback rate. note: AudioGeneratorController ignores this value.