---
title: kAUVoiceIOErr_UnexpectedNumberOfInputChannels
framework: audiotoolbox
role: symbol
role_heading: Global Variable
path: audiotoolbox/kauvoiceioerr_unexpectednumberofinputchannels
---

# kAUVoiceIOErr_UnexpectedNumberOfInputChannels

An error that indicates that the audio unit encountered an unexpected number of input channels during initialization.

## Declaration

```swift
var kAUVoiceIOErr_UnexpectedNumberOfInputChannels: OSStatus { get }
```