首先下載以下這個小程式: (免費軟件)

Normal MP3Gain installer 1.2.5:
Download link: [url]http://www.uploadjockey.com/download/9118054/mp3gain-win-1_2_5.exe[/url]

MP3Gain installer 1.2.5 with VB runtime files. VB run-time 檔只要裝一次, 所以你的電腦可能已經有了. 如果你不肯定可以直接下這個:
Download link: [url]http://www.uploadjockey.com/download/906462/mp3gain-win-full-1_2_5.exe[/url]

Mac 版:
Download link: [url]http://www.uploadjockey.com/download/1525028/MacMP3Gain-1.9.dmg[/url]

安裝完後, 只要 add files 或 folder, 按 track analysis 之後按 track gain 便完成! 又快又方便!