# MIDIEventList.Builder ``` class Builder ``` ## Topics ### Initializers [`init(inProtocol: MIDIProtocolID, wordSize: Int)`](/documentation/CoreMIDI/MIDIEventList/Builder/init(inProtocol:wordSize:)) ### Instance Properties [`var count: Int`](/documentation/CoreMIDI/MIDIEventList/Builder/count) ### Instance Methods [`func append(timestamp: MIDITimeStamp, words: [UInt32]) -> UnsafePointer?`](/documentation/CoreMIDI/MIDIEventList/Builder/append(timestamp:words:)) [`func clear()`](/documentation/CoreMIDI/MIDIEventList/Builder/clear()) [`func withUnsafeMutableMIDIEventListPointer((inout UnsafeMutableMIDIEventListPointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIEventList/Builder/withUnsafeMutableMIDIEventListPointer(_:)) [`func withUnsafePointer((UnsafePointer) -> Result) -> Result`](/documentation/CoreMIDI/MIDIEventList/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)