Latest svn and the next nightly build (along with Squeezebox2 firmware 22) implements volume normalization/Replay Gain for various audio and tag formats - ogg, FLAC, MP3Gain (APETAGEX), AACGain, RVAD (MP3 via iTunes) and RVA2.

There is now a Replay Gain setting under the Player Settings > Audio section of the web interface. This setting can take the following values:
1) Disable Replay Gain
2) Use Track Gain (if present) - uses only track gain information.
3) Use Album Gain (if present) - uses only album gain information.
4) "Smart" gain selection - uses ideas and code from James Sutula's Dynamic Transition Updater/Smart Gain plugin to dynamically choose between track and album gain. The idea is that album gain is used if successive tracks are from the same album and in track order, track gain is used otherwise.

The last is the default value of the setting. Please give this a try, post feedback and file bugs if you see any. I'm open to alternate ideas for the setting choices and default.

Thanks to Dan Sully for tag parsing/database work and James Sutula for his plugin.

--Vidur
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