loading {HEAD ~ volume control values} corresponding to {TAIL ~ the audio output port} stored in a memory unit when the external audio reproduction unit is plugged in the audio output port; and 
corresponding to
loading { HEAD ~ volume control values } corresponding to { TAIL ~ the audio output port } stored in a memory unit when the external audio reproduction unit is plugged in the audio output port ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH