Translations:Amarok/Manual/Various/ReplayGain/10/en
For .flac files, "metaflac" can be used to view embedded replay gain data:
metaflac --list Millencolin\ -\ Balanced\ Boy.flac
Among other things, this will show something like this:
METADATA block #2 type: 4 (VORBIS_COMMENT) is last: false length: 390 vendor string: reference libFLAC 1.2.1 20070917 comments: 14 comment[9]: REPLAYGAIN_REFERENCE_LOUDNESS=89.0 dB comment[10]: REPLAYGAIN_TRACK_GAIN=-1.55 dB comment[11]: REPLAYGAIN_TRACK_PEAK=0.75894165 comment[12]: REPLAYGAIN_ALBUM_GAIN=-4.19 dB comment[13]: REPLAYGAIN_ALBUM_PEAK=0.98712158