With certain songs the amplitudes can be off. One song may be a little quieter, so you turn your speakers up and the very next song in your playlist is super loud and you damage your ears. Thankfully iTunes comes with setting to fix this: in the iTunes –> Preferences, click on the Playback icons, and click on the Sound Check checkbox. With this it makes your songs volume levels the same. The setting is also automatically applied to your iPods or iPhones.
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