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# AVAudioUnitMIDIInstrument

An object that represents music devices or remote instruments.

```
class AVAudioUnitMIDIInstrument
```

## Overview

Use an [`AVAudioUnitMIDIInstrument`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument) in a chain that processes real-time (live) input and has the general concept of music events; for example, notes.

## Topics

### Creating a MIDI instrument

[`init(audioComponentDescription:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/init(audioComponentDescription:))

Creates a MIDI instrument audio unit with the component description you specify.

### Sending information to the MIDI instrument

[`sendController(_:withValue:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendController(_:withValue:onChannel:))

Sends a MIDI controller event to the instrument.

[`sendMIDIEvent(_:data1:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendMIDIEvent(_:data1:))

Sends a MIDI event which contains one data byte to the instrument.

[`sendMIDIEvent(_:data1:data2:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendMIDIEvent(_:data1:data2:))

Sends a MIDI event which contains two data bytes to the instrument.

[`sendMIDISysExEvent(_:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendMIDISysExEvent(_:))

Sends a MIDI System Exclusive event to the instrument.

[`sendPitchBend(_:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendPitchBend(_:onChannel:))

Sends a MIDI Pitch Bend event to the instrument.

[`sendPressure(_:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendPressure(_:onChannel:))

Sends a MIDI channel pressure event to the instrument.

[`sendPressure(forKey:withValue:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendPressure(forKey:withValue:onChannel:))

Sends a MIDI Polyphonic key pressure event to the instrument.

[`sendProgramChange(_:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendProgramChange(_:onChannel:))

Sends MIDI Program Change and Bank Select events to the instrument.

[`sendProgramChange(_:bankMSB:bankLSB:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/sendProgramChange(_:bankMSB:bankLSB:onChannel:))

Sends MIDI Program Change and Bank Select events to the instrument.

[`send(_:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/send(_:))

Sends a MIDI event list to the instrument.

### Starting and stopping play

[`startNote(_:withVelocity:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/startNote(_:withVelocity:onChannel:))

Sends a MIDI Note On event to the instrument.

[`stopNote(_:onChannel:)`](/documentation/AVFAudio/AVAudioUnitMIDIInstrument/stopNote(_:onChannel:))

Sends a MIDI Note Off event to the instrument.


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