---
title: gain
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/audioplaybackgroupcontroller/gain
---

# gain

The individual gain in decibels for all audio resources in the group.

## Declaration

```swift
@MainActor @preconcurrency var gain: Audio.Decibel { get set }
```

## Discussion

Discussion The gain must be zero or negative, where zero is nominal loudness and negative infinity is silent. If the gain is positive, it will be reset to zero. Use the fade(to:duration:) method to change the gain gradually and create smooth transitions.