# MIDIEventPacket.Builder ``` class Builder ``` ## Topics ### Initializers [`init(maximumNumberMIDIWords: Int)`](/documentation/CoreMIDI/MIDIEventPacket/Builder/init(maximumNumberMIDIWords:)) ### Instance Properties [`var capacity: Int`](/documentation/CoreMIDI/MIDIEventPacket/Builder/capacity) [`var count: Int`](/documentation/CoreMIDI/MIDIEventPacket/Builder/count) [`var timeStamp: Int`](/documentation/CoreMIDI/MIDIEventPacket/Builder/timeStamp) ### Instance Methods [`func append(UInt32...)`](/documentation/CoreMIDI/MIDIEventPacket/Builder/append(_:)) [`func withUnsafeMutableMIDIEventPacketPointer((inout UnsafeMutableMIDIEventPacketPointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIEventPacket/Builder/withUnsafeMutableMIDIEventPacketPointer(_:)) [`func withUnsafePointer((UnsafePointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIEventPacket/Builder/withUnsafePointer(_:)) --- Copyright © 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)