iGain was designed to be an interactive front-end for the MP3Gain and AACGain programs, designed to integrate with iTunes.

MP3Gain and AACGain use the Replaygain algorithm to compute the overall loudness of a track or album as perceived by the human ear. It then adjusts the track's volume, so that your tracks or albums appear to play at approximately the same volume. This avoids the need to constantly adjust the volume of your PC or iPod when switching from track to track.

iTunes integration allows iGain to
￭ automatically locate your music files,
￭ operate on playlists, and
￭ tag files so they will be resynced with your iPod after gain adjustments.


USAGE NOTES

1. BACK UP YOUR MUSIC FILES BEFORE USING! THIS IS EXPERIMENTAL SOFTWARE. IT IS POSSIBLE THAT THERE ARE BUGS IN THIS SOFTWARE THAT COULD CORRUPT YOUR MUSIC FILES.

2. iGain/AACGain supports files in the mp4/Quicktime file format. These files
usually have a file extension of .mp4 or .m4a. Raw AAC files, or files
encoded with HE-AAC/SBR are not supported.

3. DRM'ed files purchased from the iTunes music store are not supported. You
may convert these to .m4a format by burning them to a CD-ROM and importing them back into iTunes.

4. iGain/AACGain does not work with Soundcheck. Soundcheck should be turned off in both iTunes and your iPod.

5. iGain/AACGain does not modify the iTunNorm tag that is used to display
volume in iTunes. You will not see any change in the iTunes displayed
volume after making adjustments. You will hear the changes on playback.