This article explains how to make your MP3 files all play at the same volume, without any loss of quality, using a free audio normalization program called MP3Gain.
In this article we will show you how to normalize audio tracks without clipping in order to fix inconsistent volume levels between music tracks or fix distorted audio. How do you normalize volume in MP3Gain? Download and install MP3Gain. Load your music files. Set the Target "Normal" volume to 94dB. Click on Track Analysis.