MP3Gain——统一调整MP3的音量大小

网上下载的歌曲有个问题就是音量大小不统一，经常听歌的时候得手工去调整mp3播放器的音量输出，很麻烦。

MP3Gain是个很有用的小工具，它能把一批MP3调整为统一的音量，操作也很简单，开源免费还有免安装版。

以下是官方介绍：

Tired of reaching for your volume knob every time your mp3 player changes to a new song?
MP3Gain analyzes and adjusts mp3 files so that they have the same volume.

每当mp3播放器换一首新歌，你的手就得在音量旋钮上调整，不累么？

MP3Gain分析和调整mp3文件，让它们有统一的音量。

MP3Gain does not just do peak normalization, as many normalizers do. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear.
Also, the changes MP3Gain makes are completely lossless. There is no quality lost in the change because the program adjusts the mp3 file directly, without decoding and re-encoding.

MP3Gain不是像普通的规格化软件一样只做“尖端规格化”，相反，它是采用统计分析的方法去决定文件实际人耳听起来会有多大声。

同时，MP3Gain做出的改变是无损的，这是因为程序直接调整，mp3文件，没有解码和重编码的过程。