#204 ReplayGain tag support for volume normalization playback

[Dave]

Hi Everyone, fist I wanted to thank the developers for such an useful tool. I just discovered a couple weeks ago and it has been very helpful.

As mentioned in the tittle, I would like to suggest to add ReplayGain (RG) tag support for future versions, sometimes when comparing an original released songs with a remastered versions, there is a big volume difference (aka. "volume wars"), which makes it harder to compare both tracks. This could help to solve that issue and compare tracks in an equally perceived volume level.

This method does not required to re-encode or normalize any tracks (although some programs do have that options, but is not recommended), just read the previously analyzed tracks with RG and apply the pre-amp gains for each track. There is no actual change in the original tracks, just a volume adjustment to match output levels.

More info. on ReplayGain
https://wiki.hydrogenaud.io/index.php?title=ReplayGain_2.0_specification

https://en.wikipedia.org/wiki/ReplayGain

Thank you.