sampsyo/beets — pull request #94 by daveisadork (2013-02-05 13:14:40+00:00)
Title: Adds support for Replay Gain tags on MP4 files

* Stores Replay Gain info in MP4 files using the format
'---:com.apple.iTunes:replaygain_*' which is used by FB2K

This also in preparation for reading/writing SoundCheck tags and being able to convert between RG and SC.