Headphones. Microphones. Adjust the Sound Settings on Your PC or - Adjust Sound Settings on ... Download MP3Gain - A Free Sound Amplifier! MP3Gain is a wonderful freeware that makes normalizing sound of audio files a piece of cake!
It is a free sound amplifier with which you can amplify any MP3 files with just a single click! 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.