If you insist on adding audio, make sure they have some control over it -- volume or muting controls would work fine.
如果坚持添加声音效果，必须保证访问者能够控制音量，特别是可以减小音量。
gradually decreasing in tempo and volume.
节奏或音量逐渐减小的。
Move the slider bar to increase or decrease your speaker volume
请移动滚动条增大或减小扬声器音量
To decrease speaker volume, press the bottom volume button repeatedly until you reach the desired volume level.
减小听筒音量，请重复按下部音量控制键，直到达到理想音量音量控制方向改变
To reduce(a perfect or minor interval)by a semitone.
把（音程）减半音把（纯音程或小音程）减小半度
If the volume level is too high, the speaker protection circuit activates, and the sound level drops suddenly.
如果音量电平太高，扬声器保护电路即起作用而突然地减小声音。
To increase and decrease in volume or pitch as if in waves.
忽大忽小，忽快忽慢在音量或音调高低上像波一样增加或减少
(of musical intervals) reduction by a semitone of any perfect or minor musical interval.
（指音程）将完整音程或者小调音程减去半音程。
Move the slider bar to increase or decrease your microphone volume, and move it all the way to the left to mute your microphone
请移动滚动条增大或减小话筒音量，并将其移动到最左侧以使话筒静音
reduce volume, quantity, pressure, speed
缩小体积、 减少数量、 降低压力、 减低速度
sink one's voice to a whisper
把自己的声音减小变成耳语.
They've made great effort to lessen the noise of planes.
他们尽力减小飞机的噪音。
HI-low switch button for ringer sound adjust.
音量控制钮：调整电话铃声音量大小。
If you press the up and down volume buttons at the same time during a call, the pulsing LED turns off for the duration of that call.
如果在通话中同时按下音量增大及减小键，显示灯在通话过程中熄灭。
attenuation in the volume of the sound.
电力不足造成音量的减弱。
gradually diminishing in brightness or loudness or strength.
声音、力量或亮度的逐渐减弱。
Please turn the television down a bit.
请把电视机音量关小点。
Would you please turn down the TV?
请你把音量调小点好吗？