---
title: defaultInstrument
framework: avfaudio
role: symbol
role_heading: Type Property
path: avfaudio/avextendednoteonevent/defaultinstrument
---

# defaultInstrument

A constant that represents the default instrument identifier.

## Declaration

```swift
class let defaultInstrument: UInt32
```

## Discussion

Discussion The system uses the instrument loaded on the channel groupID.