info.add_child(L"stage", stage_info.get());
info.add_child(L"mixer", mixer_info.get());
info.add_child(L"output", output_info.get());
info.add_child(L"stage", stage_info.get());
info.add_child(L"mixer", mixer_info.get());
info.add_child(L"output", output_info.get());