# MIDIPacket.Builder ``` class Builder ``` ## Topics ### Initializers [`init(maximumNumberMIDIBytes: Int)`](/documentation/CoreMIDI/MIDIPacket/Builder/init(maximumNumberMIDIBytes:)) ### Instance Properties [`var capacity: Int`](/documentation/CoreMIDI/MIDIPacket/Builder/capacity) [`var count: Int`](/documentation/CoreMIDI/MIDIPacket/Builder/count) [`var timeStamp: Int`](/documentation/CoreMIDI/MIDIPacket/Builder/timeStamp) ### Instance Methods [`func append(UInt8...)`](/documentation/CoreMIDI/MIDIPacket/Builder/append(_:)) [`func withUnsafeMutableMIDIPacketPointer((inout UnsafeMutableMIDIPacketPointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIPacket/Builder/withUnsafeMutableMIDIPacketPointer(_:)) [`func withUnsafePointer((UnsafePointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIPacket/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)