英文關鍵字
volume
level
meter
audio
arrow
indicator
vintage
sound
dial
analog
recording
amplify
stereo
retro
music
classic
equipment
tape
signal
display
needle
amplifier
db
voltage
pointer
old
illuminated
peak
device
decibel
nostalgia
value
output
hifi
interface
movement
60s
analyzing
acoustic
monitor
home
speech
graduation
70s
record
gauge
play