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