<!--
{
  "availability" : [
    "iOS: 16.0.0 -",
    "iPadOS: 16.0.0 -",
    "macCatalyst: 16.0.0 -",
    "macOS: 13.0.0 -",
    "tvOS: 16.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "AVFAudio",
  "identifier" : "/documentation/AVFAudio/AVExtendedNoteOnEvent/init(midiNote:velocity:instrumentID:groupID:duration:)-rqr5",
  "metadataVersion" : "0.1.0",
  "role" : "Initializer",
  "symbol" : {
    "kind" : "Initializer",
    "modules" : [
      "AVFAudio"
    ],
    "preciseIdentifier" : "c:objc(cs)AVExtendedNoteOnEvent(im)initWithMIDINote:velocity:instrumentID:groupID:duration:"
  },
  "title" : "init(midiNote:velocity:instrumentID:groupID:duration:)"
}
-->

# init(midiNote:velocity:instrumentID:groupID:duration:)

Creates a note on event with the default instrument.

```
init(midiNote: Float, velocity: Float, instrumentID: UInt32, groupID: UInt32, duration: AVMusicTimeStamp)
```

## Parameters

`midiNote`

The MIDI note number.

`velocity`

The MIDI velocity.

`instrumentID`

The default instrument.

`groupID`

The identifier that represents the audio unit channel that handles the event.

`duration`

The duration of the event, in beats.

## Discussion

Use [`defaultInstrument`](/documentation/AVFAudio/AVExtendedNoteOnEvent/defaultInstrument) when you set `instrumentID`.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)