Replay Gain: A how to informational

@Soukyuu

I have found that changing the ReplayGain setting in the Clip+ (song/album/off) does take effect until I return to the music list and re-start the song - obviously difficult to hear a difference when the replaygain value maybe less than +/- 1 db. I manually altered the RG value by 10db and could definitely hear the difference between RG on or off.