---
title: key
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avmidinoteevent/key
---

# key

The MIDI key number.

## Declaration

```swift
var key: UInt32 { get set }
```

## See Also

### Configuring a MIDI Note Event

- [channel](avfaudio/avmidinoteevent/channel.md)
- [velocity](avfaudio/avmidinoteevent/velocity.md)
- [duration](avfaudio/avmidinoteevent/duration.md)