Let's say I have an X music track in some lossless format (wav?).
If I convert it to MP3 format with its original volume and get the file "A.mp3".
Then I edit the lossless source and reduce the volume by 50% (in some way without affecting its quality) and convert it to MP3 and get the file "B.mp3".
Will be any size difference between "A.mp3" and "B.mp3"?
Does the volume reduction cause a loss of information?