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# AVMIDISysexEvent

An object that represents a MIDI system exclusive message.

```
class AVMIDISysexEvent
```

## Overview

You can’t modify the size and contents of this event once you create it.

## Topics

### Creates a System Event

[`init(data:)`](/documentation/AVFAudio/AVMIDISysexEvent/init(data:))

Creates a system event with the data you specify.

### Getting the Size of the Event

[`sizeInBytes`](/documentation/AVFAudio/AVMIDISysexEvent/sizeInBytes)

The size of the data that this event contains.


---

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