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# AVAudioIONode

An object that performs audio input or output in the engine.

```
class AVAudioIONode
```

## Overview

When rendering to and from an audio device in macOS, [`AVAudioInputNode`](/documentation/AVFAudio/AVAudioInputNode) and [`AVAudioOutputNode`](/documentation/AVFAudio/AVAudioOutputNode) communicate with the system’s default input and output devices. In iOS, they communicate with the devices appropriate to the app’s [`AVAudioSession`](/documentation/AVFAudio/AVAudioSession) category, configurations, and user actions, such as connecting or disconnecting external devices.

In the manual rendering mode, [`AVAudioInputNode`](/documentation/AVFAudio/AVAudioInputNode) and [`AVAudioOutputNode`](/documentation/AVFAudio/AVAudioOutputNode) perform the input and output in the engine in response to the client’s request.

## Topics

### Getting the Audio Unit

### Getting the I/O Latency

[`presentationLatency`](/documentation/AVFAudio/AVAudioIONode/presentationLatency)

The presentation or hardware latency, applicable when rendering to or from an audio device.

### Getting and Setting the Voice Processing State

[`setVoiceProcessingEnabled(_:)`](/documentation/AVFAudio/AVAudioIONode/setVoiceProcessingEnabled(_:))

Enables or disables voice processing on the I/O node.

[`isVoiceProcessingEnabled`](/documentation/AVFAudio/AVAudioIONode/isVoiceProcessingEnabled)

A Boolean value that indicates whether voice processing is in an enabled state.


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