Audio Hardware Services Properties Property identifiers that apply to HAL audio objects only when accessed via the Audio Hardware Services. TopicsConstantskAudioHardwareServiceProperty_ServiceRestartedkAudioHardwareServiceDeviceProperty_VirtualMainBalancekAudioHardwareServiceDeviceProperty_VirtualMainVolume See AlsoManaging System Sound Services PropertiesAudioServicesGetPropertyInfo(_:_:_:_:_:)AudioServicesGetProperty(_:_:_:_:_:)AudioServicesSetProperty(_:_:_:_:_:)AudioServicesPropertyIDSystem Sound Services Property Identifiers