hda_create_group_control
uint32 parent = hda_create_group_control(multi, &index, 0, S_OUTPUT, NULL);
parent2 = hda_create_group_control(multi, &index, parent, S_null, name);
parent2 = hda_create_group_control(multi, &index,
parent = hda_create_group_control(multi, &index, 0, S_INPUT, NULL);
parent2 = hda_create_group_control(multi, &index,