---
title: AVAudioSession.IOType.notSpecified
framework: avfaudio
role: symbol
role_heading: Case
path: avfaudio/avaudiosession/iotype/notspecified
---

# AVAudioSession.IOType.notSpecified

The default audio session I/O type.

## Declaration

```swift
case notSpecified
```

## Discussion

Discussion Use this I/O type if your app doesn’t use AVCaptureSession, or doesn’t have any specific requirements for aggregating input and output audio in the same realtime I/O callback. If your app doesn’t use a capture session, it gets aggregated I/O when using the playAndRecord category. If your app uses a capture session, specifying this value allows the session to start recording without causing glitches in the already running output audio. It also allows the system to use power-saving optimizations.

## See Also

### I/O Types

- [AVAudioSession.IOType.aggregated](avfaudio/avaudiosession/iotype/aggregated.md)