英文關鍵字
indicator
volume
level
sound
vintage
dial
signal
vu
two
meter
db
moving
analog
arrow
music
ampere
stereo
retro
recording
control
peak
amplifier
audio
equipment
speech
classic
display
recorder
radio
studio
measurement
close
dashboard
monitor
nobody
amp
gauge
loudness
illuminated
sync
decibel
player
electronic
media
listening
channel
working
scale
limit
broadcasting