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# source

An audio stream source that defines how the host supplies audio data for the guest.

```
var source: VZAudioInputStreamSource? { get set }
```

## Discussion

Not specifying a source results in a default handler that produces audio silence. The default is `nil`.

## See Also

[`VZAudioInputStreamSource`](/documentation/Virtualization/VZAudioInputStreamSource)

The base class for an audio input stream source.

[`VZHostAudioInputStreamSource`](/documentation/Virtualization/VZHostAudioInputStreamSource)

The host audio input stream source that provides audio from the host system’s default input device.


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