The mp3 music folders in our music library have been recorded at various amplitudes (volumes).
Can this software function as a volume control/equalization to elimenate the variances
in the recorded volumes.
I often use Foobar2000 to update the replay-gain (similar to sound check) level.
The nice thing is that it can alter the tracks permanently and not only by a virtual ID3-tag which will be ignored in some players.
We are not able to offer e-mail or telephone support.
Posting your e-mail address on a public forum is a bad idea as it is likely to attract a great deal of spam.
I have removed your e-mail address from your post.
As previously described, the best solution to the problem for iTunes users is to use SoundCheck.
LAME is an encoder (it writes MP3 files). “Decoder” means to read a file format.
The trouble with all that above is that it’s a manual job, and that to make a song sound “as equally loud” as another, you need to adjust the blue waves based on the height of the light blue (rms) section, not the top or bottom (peak level) of the waveform.
The other point is that MP3 encoding is lossy. There is absolutely no need to degrade the MP3 by re-encoding it if you only want to adjust its volume.
I would certainly have offered an Audacity tutorial if there were one that is lossless. Alas, there is none, at least if you want an mp3 again.
That’s why I’ve suggested the Foobar2000 solution.
In general, there are three ways to correct the volume:
Open the file in Audacity, change the amplitude and encode the mp3 anew (= quality loss)
Changing the ID3 tag by providing a sound-check/replay gain offset.
Changing individual mp3 frames with e.g. Sox, Mp3-cut or similar (no new encoding necessary); the steps are roughly 1.4 dB.