# Create Allocates and initializes an instance of the custom property class. ``` static OSSharedPtr Create(IOUserAudioDriver *in_audio_driver, IOUserAudioObjectPropertyAddress in_prop_addr, bool in_is_property_settable, IOUserAudioCustomPropertyDataType in_qualifier_data_type, IOUserAudioCustomPropertyDataType in_data_type); ``` ## Parameters `in_audio_driver` The [`IOUserAudioDriver`](/documentation/AudioDriverKit/IOUserAudioDriver) that owns this object. `in_prop_addr` [`IOUserAudioObjectPropertyAddress`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioObjectPropertyAddress) of the custom property. `in_is_property_settable` A Boolean value that indicates if the property can be set. `in_qualifier_data_type` The [`IOUserAudioCustomPropertyDataType`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioCustomPropertyDataType) for custom property’s qualifier data value. `in_data_type` The [`IOUserAudioCustomPropertyDataType`](/documentation/AudioDriverKit/AudioDriverKit/IOUserAudioCustomPropertyDataType) for custom property’s data value.This value can’t be `IOUserAudioCustomPropertyDataType::None`. ## Return Value A poiner to an [`IOUserAudioCustomProperty`](/documentation/AudioDriverKit/IOUserAudioCustomProperty), if allocation and initialization succeeded. ## Discussion If you subclass [`IOUserAudioCustomProperty`](/documentation/AudioDriverKit/IOUserAudioCustomProperty) to override this class’ behavior, don’t use [`Create`](/documentation/AudioDriverKit/IOUserAudioCustomProperty/Create) to allocate and initialize the custom subclass. --- 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)