---
title: CAFInstrumentChunk
framework: audiotoolbox
role: symbol
role_heading: Structure
path: audiotoolbox/cafinstrumentchunk
---

# CAFInstrumentChunk

## Declaration

```swift
struct CAFInstrumentChunk
```

## Topics

### Initializers

- [init()](audiotoolbox/cafinstrumentchunk/init().md)
- [init(mBaseNote:mMIDILowNote:mMIDIHighNote:mMIDILowVelocity:mMIDIHighVelocity:mdBGain:mStartRegionID:mSustainRegionID:mReleaseRegionID:mInstrumentID:)](audiotoolbox/cafinstrumentchunk/init(mbasenote:mmidilownote:mmidihighnote:mmidilowvelocity:mmidihighvelocity:mdbgain:mstartregionid:msustainregionid:mreleaseregionid:minstrumentid:).md)

### Instance Properties

- [mBaseNote](audiotoolbox/cafinstrumentchunk/mbasenote.md)
- [mInstrumentID](audiotoolbox/cafinstrumentchunk/minstrumentid.md)
- [mMIDIHighNote](audiotoolbox/cafinstrumentchunk/mmidihighnote.md)
- [mMIDIHighVelocity](audiotoolbox/cafinstrumentchunk/mmidihighvelocity.md)
- [mMIDILowNote](audiotoolbox/cafinstrumentchunk/mmidilownote.md)
- [mMIDILowVelocity](audiotoolbox/cafinstrumentchunk/mmidilowvelocity.md)
- [mReleaseRegionID](audiotoolbox/cafinstrumentchunk/mreleaseregionid.md)
- [mStartRegionID](audiotoolbox/cafinstrumentchunk/mstartregionid.md)
- [mSustainRegionID](audiotoolbox/cafinstrumentchunk/msustainregionid.md)
- [mdBGain](audiotoolbox/cafinstrumentchunk/mdbgain.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Sendable](swift/sendable.md)

## See Also

### File Structure

- [CAFAudioDescription](audiotoolbox/cafaudiodescription.md)
- [CAFAudioFormatListItem](audiotoolbox/cafaudioformatlistitem.md)
- [CAFChunkHeader](audiotoolbox/cafchunkheader.md)
- [CAFDataChunk](audiotoolbox/cafdatachunk.md)
- [CAFFileHeader](audiotoolbox/caffileheader.md)
- [CAFFormatFlags](audiotoolbox/cafformatflags.md)
- [CAFInfoStrings](audiotoolbox/cafinfostrings.md)
- [CAFMarker](audiotoolbox/cafmarker.md)
- [CAFMarkerChunk](audiotoolbox/cafmarkerchunk.md)
- [CAFOverviewChunk](audiotoolbox/cafoverviewchunk.md)
- [CAFOverviewSample](audiotoolbox/cafoverviewsample.md)
- [CAFPacketTableHeader](audiotoolbox/cafpackettableheader.md)
- [CAFPeakChunk](audiotoolbox/cafpeakchunk.md)
- [CAFPositionPeak](audiotoolbox/cafpositionpeak.md)
- [CAFRegion](audiotoolbox/cafregion.md)