@interface _RealityKit_SwiftUI.SoundManager : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ serializer;
    void /* unknown type, empty encoding */ state;
    void /* unknown type, empty encoding */ module;
    void /* unknown type, empty encoding */ engine;
    void /* unknown type, empty encoding */ mainMixer;
}

- (void)handleEngineConfigChange:(id)a0;

@end