---
title: "init(mBaseNote:mMIDILowNote:mMIDIHighNote:mMIDILowVelocity:mMIDIHighVelocity:mdBGain:mStartRegionID:mSustainRegionID:mReleaseRegionID:mInstrumentID:)"
framework: audiotoolbox
role: symbol
role_heading: Initializer
path: "audiotoolbox/cafinstrumentchunk/init(mbasenote:mmidilownote:mmidihighnote:mmidilowvelocity:mmidihighvelocity:mdbgain:mstartregionid:msustainregionid:mreleaseregionid:minstrumentid:)"
---

# init(mBaseNote:mMIDILowNote:mMIDIHighNote:mMIDILowVelocity:mMIDIHighVelocity:mdBGain:mStartRegionID:mSustainRegionID:mReleaseRegionID:mInstrumentID:)

## Declaration

```swift
init(mBaseNote: Float32, mMIDILowNote: UInt8, mMIDIHighNote: UInt8, mMIDILowVelocity: UInt8, mMIDIHighVelocity: UInt8, mdBGain: Float32, mStartRegionID: UInt32, mSustainRegionID: UInt32, mReleaseRegionID: UInt32, mInstrumentID: UInt32)
```