[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)() class UMetaSoundBuilderSubsystem : public [UEngineSubsystem](API\Runtime\Engine\Subsystems\UEngineSubsystem), public [Metasound::Frontend::IMetaSoundDocumentBuilderRegistry](API\Plugins\MetasoundFrontend\IMetaSoundDocumentBuilderRegistr-)