# AudioUnitGetProperty(_:_:_:_:_:_:) Gets the value of an audio unit property. ``` func AudioUnitGetProperty(_ inUnit: AudioUnit, _ inID: AudioUnitPropertyID, _ inScope: AudioUnitScope, _ inElement: AudioUnitElement, _ outData: UnsafeMutableRawPointer, _ ioDataSize: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `inUnit` The audio unit that you want to get a property value from. `inID` The identifier for the property. `inScope` The audio unit scope for the property. `inElement` The audio unit element for the property. `outData` On successful output, the current value for the specified audio unit property. Set this parameter to `NULL` when calling this function if you only want to determine how much memory to allocate for a variable size property. `ioDataSize` On input, the expected size of the property value, as pointed to by the `outData` parameter. On output, the size of the data that was returned. ## Return Value A result code. ## Discussion Some Core Audio property values are C types and others are Core Foundation objects. If you call this function to retrieve a value that is a Core Foundation object, then this function—despite the use of “Get” in its name—duplicates the object. You are responsible for releasing the object, as described in [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029) in [Memory Management Programming Guide for Core Foundation](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/CFMemoryMgmt.html#//apple_ref/doc/uid/10000127i). --- 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)