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eschurr
2005-11-11, 19:00
Does anyone know the best way to generate volume adjustment tags for a library of iTunes songs?

I know iTunes has a feature called Song Check, but there's no explanation how it works -- does it generate the volume adjustments when it rips songs, plays songs, or what?

i wnat to generate tags for every song in my library (that needs it) so i can take advantage of the newest features in SS 6.2

dean
2005-11-12, 07:28
On Nov 11, 2005, at 6:00 PM, eschurr wrote:
> Does anyone know the best way to generate volume adjustment tags for a
> library of iTunes songs?
>
> I know iTunes has a feature called Song Check, but there's no
> explanation how it works -- does it generate the volume adjustments
> when it rips songs, plays songs, or what?
>
> i wnat to generate tags for every song in my library (that needs
> it) so
> i can take advantage of the newest features in SS 6.2
If you go into iTunes Preferences you can turn on sound check and it
will scan your whole library and add the appropriate tags.

eschurr
2005-11-13, 16:01
Thanks, Dean.

Does Sound Check work very well? i turned it on and was suprised (disappointed) to find very few songs have any adjustments and I know many songs need them.

is it better to use something like MP3Gain? I like the fact that Sound Check will work with both my iPod and SlimServer, but optimizing the results for SlimServer is the most important thing to me.

jameshavelock
2006-04-16, 11:52
It seems the best option is to use iVolume - this is an advanced version of soundcheck.

http://www.mani.de/en/software/macosx/ivolume/index.html

Note it is not free but does have nice features such as linking sound check to an album so all the volume increases are relative per album. And it says it also does this:

iVolume improves the built-in 'Sound Check' function of iTunes to have your songs actually play at the same volume level.

iTunes uses a very fast algorithm to quickly analyze the volume of its songs. It's fast, but it's not very accurate. iVolume corrects the volume information that iTunes has calculated with better values. Therefore an algorithm is used that is oriented on the perception of the human ears. The result is a huge improvement of the 'Sound Check' function. You never have to readjust the main volume again when playing back your songs in random order. This is perfect e. g. for music on partys or hearing songs in random order with the iPod.

iVolume does not re-encode your audio files, so there is no loss in quality. Technically it looks for the tag named 'iTunNORM' that iTunes has put into your songs and iVolume just replaces the embedded value describing the volume of the song with a better one.

iVolume works closely with iTunes. Instead of reinventing the wheel or complicated handling with files at the filesystem level, iTunes is used as the interface to select the songs you want to adjust with iVolume. After selecting songs in iTunes, just switch over to iVolume and hit the 'Adjust' button to make the selected songs to the same volume level.

Find more information about the loudness analyzing algorithm used in iVolume here:
http://replaygain.hydrogenaudio.org/