iTunes seems to scan for the highest peak in a song's volume.
Last but not least, there's the loudness war ( long text and short video explanations). With Sound Check enabled, track 13 is 12dB louder than track 12, which makes for a jarring listening experience. Without Sound Check, track 13 is a seamless continuation of track 12. If you are the proud owner of Pink Floyd's The Wall, have a listen to tracks 12 and 13 of the first CD. The second problem is that Sound Check works per song. This seems to have been fixed at some point, but unfortunately, there is no way to reevaluate the volume of songs that have already be scanned, so affected songs remain too quiet. The first problem is that older versions of iTunes didn't calculate the volumes correctly: AAC-encoded files would consistently be quieter than MP3 files.
#Ivolume says itunes not installed mac os x
Because the actual volume adjustment happens during playback and Mac OS X internally stores audio as 32-bit floating point values, this doesn't result in a reduction in quality. When playing back, loud songs are reduced in volume and quiet ones receive a boost, so the resulting playback volume is constant from song to song. If iTunes' Sound Check feature (under the Playback pane in the program's preferences) is enabled, iTunes scans all songs in the library to determine their volume. So I decided to get an iPod: gigs upon gigs worth of storage, and the iTunes/iPod "Sound Check" feature would forever solve my issues with uneven song volumes. Then, after a trip to Amsterdam, I arrived back home sans MP3 player. Some songs would barely whisper, while others would make my ears bleed. When I got my first MP3 player many moons ago-one of those 128MB USB-sticks-with-a-headphone-jack affairs-the thing that drove me crazy was the wildly uneven volume from song to song.
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