---
title: feedback
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiounitdelay/feedback
---

# feedback

The amount of the output signal that feeds back into the delay line.

## Declaration

```swift
var feedback: Float { get set }
```

## Discussion

Discussion You specify the feedback as a percentage. The default value is 50%. The valid range of values is -100% to 100%.

## See Also

### Getting and setting the delay values

- [delayTime](avfaudio/avaudiounitdelay/delaytime.md)
- [lowPassCutoff](avfaudio/avaudiounitdelay/lowpasscutoff.md)
- [wetDryMix](avfaudio/avaudiounitdelay/wetdrymix.md)