loading {HEAD ~ volume control values} corresponding to {TAIL ~ the speakers} stored in the memory unit when the external audio reproduction unit is unplugged 
corresponding to
loading { HEAD ~ volume control values } corresponding to { TAIL ~ the speakers } stored in the memory unit when the external audio reproduction unit is unplugged
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH