![]() ![]() Track gain works for each distinct track across your collection as described above. There are two types of Replay Gain: track gain and album gain. ![]() The result is that all music with the gain value is output at the ideal volume, eliminating the inconsistencies between tracks. Most do, with the notable exception of iTunes. ![]() This means your music player must support Replay Gain. When your music player plays music, if it supports Replay Gain it reads the gain value and applies this to the playback, increasing or decreasing the volume. This would cause problems with lossy compressed music. I like the fact that the difference is stored as a tag because this way the original music is not touched. Then, the difference between the ideal and the actual volume is calculated and the difference (the 'gain') stored inside the music file as a tag. By analysing the sound data in a digital music file the loudness can be determined. Replay Gain is a method for calculating the difference in volume from a stated 'ideal' volume and the volume in your digital music tracks or groups of tracks (the latter is important for reasons I'll reveal later). I realised I had never applied Replay Gain to my music collection. ![]() It's particularly a problem when creating shuffled playlists because the biggest differences are from recording to recording rather than from album track to album track. When ripping CDs, volume can be different from CD to CD. When music is acquired from different sources the volume levels can vary. The next track, the decidedly more racey Black Cab by Jens Lekman, kicked in with the opposite problem, and I had to dive for the remote control to lower the volume and avoid waking the neighbours! The first track, Fairport Convention's Who Knows Where The Time Goes? was very quiet so I upped the volume several notches. I had setup a shuffled 'Sunday morning' playlist of soothing tracks, mostly non-classical. Last Sunday I fell afoul of a problem shared by many digital music enthusiasts: divergent mp3 volume. MP3 volume - using Replay Gain to normalise digital music volume ![]()
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