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