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

# key

The MIDI key number.

## Declaration

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

## See Also

### Configuring a Poly Pressure Event

- [pressure](avfaudio/avmidipolypressureevent/pressure.md)