---
title: "init(sourceAudioUnit:sourceOutputNumber:destInputNumber:)"
framework: audiotoolbox
role: symbol
role_heading: Initializer
path: "audiotoolbox/audiounitconnection/init(sourceaudiounit:sourceoutputnumber:destinputnumber:)-6kg20"
---

# init(sourceAudioUnit:sourceOutputNumber:destInputNumber:)

## Declaration

```swift
init(sourceAudioUnit: AudioUnit?, sourceOutputNumber: UInt32, destInputNumber: UInt32)
```