An audio/video device having {HEAD ~ a volume control function} for external audio reproduction units by using {TAIL ~ volume control buttons} of a remote controller is provided 
by using
An audio / video device having { HEAD ~ a volume control function } for external audio reproduction units by using { TAIL ~ volume control buttons } of a remote controller is provided
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH