# getDefaultAudioSession(completionHandler:) Retrieves the audio session that contains all sounds that implicitly belong to this scene. ``` nonisolated func getDefaultAudioSession(completionHandler handler: @escaping @Sendable (AVAudioSession?) -> Void) ``` ``` nonisolated var defaultAudioSession: AVAudioSession? { get async } ``` ## Discussion In visionOS, the default for a [`UIScene`](/documentation/UIKit/UIScene) contains all of the RealityKit sounds from any in the scene’s view hierarchy. The default audio session’s initial configuration is mixable, with set to . This configuration ensures that the scene’s default audio session doesn’t interfere with existing behavior of the app’s primary audio session, . However, you can modify the default audio session’s properties as needed. You can safely call this method on a non-main thread. It’s recommended to get a scene’s default audio session from a non-main thread to avoid calling resource-intensive interfaces from the main thread, which can have a negative impact on the responsiveness of the user experience. --- 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)