Check out MP3Gain
From their website:
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.
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.
Lifewire has a nice tutorial on using MP3Gain
How to Normalize MP3 Files to Play at the Same Volume
If you listen to MP3 files on your computer, iPod, or MP3/media player then there's a good chance that you've had to adjust the volume between tracks because of varying loudness. If a track is too loud then clipping can occur (due to overload) which distorts the sound. If a track is too quiet, you'll normally need to increase the volume; audio detail can also be lost. By using audio normalization you can adjust all your MP3 files so that they all play at the same volume.
The following tutorial will show you how to use a freeware program for the PC, called MP3Gain, to normalize your MP3 files without losing audio quality. This lossless technique (called Replay Gain) uses the ID3 metadata tag to adjust the "loudness" of the track during playback rather than resampling each file which some programs do; resampling typically decreases sound quality.
I was looking for this as, over the years, I have accumulated several hundred thousand tracks of various music and a lot of them have varying levels of gain. Playing them necessitates reaching for the level control when a new track comes on. With MP3Gain, I can batch process all of the files - let it run overnight if need be.
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