Audio/video device having {HEAD ~ a volume control function} for {TAIL ~ an external audio reproduction unit} by using volume control buttons of a remote controller and volume control method therefor 
for
Audio / video device having { HEAD ~ a volume control function } for { TAIL ~ an external audio reproduction unit } by using volume control buttons of a remote controller and volume control method therefor
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH