英文關鍵字
volume
level
meter
audio
two
arrow
round
indicator
vintage
sound
dial
analog
recording
amplify
scale
stereo
retro
vu
listening
music
classic
recorder
equipment
tape
gauge
voice
signal
display
playback
decibel
limit
analyzing
unit
amplifier
information
analysis
analogue
wave
sync
electricity
nobody
hifi
dj
tune
power
system