# MIDIDeviceAddEntity(_:_:_:_:_:_:) Specifies one of the entities that make up a device. ``` func MIDIDeviceAddEntity(_ device: MIDIDeviceRef, _ name: CFString, _ embedded: Bool, _ numSourceEndpoints: Int, _ numDestinationEndpoints: Int, _ newEntity: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `device` The device to which an entity is to be added. `name` The name of the new entity. `embedded` True if this entity is inside the device, false if the entity simply consists of external connectors to which other devices can be attached. `numSourceEndpoints` The number of source endpoints the entity has. `numDestinationEndpoints` The number of destination endpoints the entity has. `newEntity` On successful return, points to the newly-created entity. ## Return Value An OSStatus result code. ## Discussion --- 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)