---
title: mBackFrontFade
framework: audiotoolbox
role: symbol
role_heading: Instance Property
path: audiotoolbox/audiobalancefade/mbackfrontfade
---

# mBackFrontFade

The audio front/back fade, where -1 represents full rear, 0 represents center, and +1 represents full front.

## Declaration

```swift
var mBackFrontFade: Float32
```