---
title: kAUNodeInteraction_InputCallback
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kaunodeinteraction_inputcallback
---

# kAUNodeInteraction_InputCallback

input callbacks being registered to a single audio unit’s input bus.

## Declaration

```swift
var kAUNodeInteraction_InputCallback: UInt32 { get }
```

## See Also

### Constants

- [kAUNodeInteraction_Connection](audiotoolbox/kaunodeinteraction_connection.md)