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/


-- 
jameshavelock
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View this thread: http://forums.slimdevices.com/showthread.php?t=18113

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