# MIDIPacketList.Builder ``` class Builder ``` ## Topics ### Initializers [`init(byteSize: Int)`](/documentation/CoreMIDI/MIDIPacketList/Builder/init(byteSize:)) ### Instance Properties [`var count: Int`](/documentation/CoreMIDI/MIDIPacketList/Builder/count) ### Instance Methods [`func append(timestamp: MIDITimeStamp, data: [UInt8]) -> UnsafePointer?`](/documentation/CoreMIDI/MIDIPacketList/Builder/append(timestamp:data:)) [`func clear()`](/documentation/CoreMIDI/MIDIPacketList/Builder/clear()) [`func withUnsafeMutableMIDIPacketListPointer((inout UnsafeMutableMIDIPacketListPointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIPacketList/Builder/withUnsafeMutableMIDIPacketListPointer(_:)) [`func withUnsafePointer((UnsafePointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIPacketList/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)