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