---
title: kSpeechOutputToExtAudioFileProperty
framework: applicationservices
role: symbol
role_heading: Global Variable
path: applicationservices/kspeechoutputtoextaudiofileproperty
---

# kSpeechOutputToExtAudioFileProperty

Set the speech output destination to an extended audio file or to the computer’s speakers.

## Declaration

```swift
let kSpeechOutputToExtAudioFileProperty: CFString
```

## Discussion

Discussion The value associated with this property is a CFNumber object whose value is an ExtAudioFileRef. To write the speech output to an extended audio file, use the file’s ExtAudioFileRef; to generate sound through the computer’s speakers, use NULL. This property works with the SetSpeechProperty(_:_:_:) function.