Album Based Soundcheck

iTunes supports a feature called Sound Check. Similar to ReplyGain in other players, the goal is make songs playback at a similar volume. This is particularly useful with mixes, songs from various albums do not have jarring transitions. Since this computed on a song-by-song basis, different songs on a single album get different values. In some cases this creates a jarring experience while listening*.

For example: Muse's Absolution has an introduction track that never gets terribly loud, but leads in directly to a normal song. Sound Check did the following:

The ending of the first track is meant to be the same volume as the beginning of the second, but because of Sound Check, this doesn't happen.

I have written album_soundcheck.py which computes the average volume of m4a or mp3 files and replaces the iTunes information ...

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Permalink | Posted: Jan 15, 2009 | Tags: python osx music

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