麦克风音量，ECHO音量和音乐主音量起始音量和限制音量设定功能；

The MIC, ECHO & music volume, its starting & limit the volume setting function;

youdao

你们是在iPod上安装了音量限制吗？

Whattsa matter? You install the volume limiter on your iPod?

youdao

该条给出了附加放大的限制和音量控制范围。

Limits for the additional amplification and range of volume control are given.

youdao