With that information, it tweaks the ID3 tag of each song to create a roughly even volume for all songs. Sound Check then calculates the average volume level of all of your music.
It doesn't edit music files or actually change their real volume. Instead, Sound Check scans all of your music to understand its basic volume information. The way Sound Check works is really smart. Conversely, when Sound Check is off, the ID3 data is ignored, and no volume adjustments are made. When Sound Check is on, your phone automatically reads and adjusts the playback volume based on how loud the ID3 tag says the song normally is. Instead, the iPhone scans the song to see how loud it is, and stores that information in what is called its "ID3 tag." Sound Check doesn't go in and modify your music files on a molecular level, so to speak. Stop listening to people saying that sound check should be turned off and their reasoning being "I noticed a major difference right away." That's not how things work.
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