How to Normalize the Volume on an iPod Playlistby Adam Brown
If you have a large collection of music on your iPod, chances are many of your songs have been recorded at varying volume levels. A very loud track that begins to play after your ears have adjusted to a lower volume can come as quite a surprise and cause temporary discomfort. However, your iPod has a sound check setting that normalizes all songs to an even volume so you can listen to your playlist peacefully.
Tap the Settings icon.
Select "Music" from the Settings menu.
Move the slider corresponding to Sound Check from OFF to ON.