# UnsafeMutableMIDIEventListPointer ``` struct UnsafeMutableMIDIEventListPointer ``` ## Topics ### Initializers [`init?(UnsafeMutablePointer?, wordSize: Int)`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/init(_:wordSize:)) [`init(UnsafeMutablePointer, wordSize: Int, inProtocol: MIDIProtocolID)`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/init(_:wordSize:inProtocol:)) ### Instance Properties [`var count: Int`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/count) [`var lastPacket: UnsafeMutablePointer?`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/lastPacket) [`var listSizeInBytes: Int`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/listSizeInBytes) [`var midiProtocol: MIDIProtocolID`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/midiProtocol) ### Instance Methods [`func append(timestamp: MIDITimeStamp, words: [UInt32]) -> UnsafePointer?`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/append(timestamp:words:)) [`func clear()`](/documentation/CoreMIDI/UnsafeMutableMIDIEventListPointer/clear()) ## Relationships ### Conforms To [`Sequence`](/documentation/Swift/Sequence) --- 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)