So in the end, I just wanted to warn people before they "normalize" anything: if you're an audiophile, you probably don't use mp3 anyway -), if you're an average user, you probably won't notice any damage to songs that were converted correctly on the first place but reconverting an mp3 that has some click or other defect might increase them in a very noticeable way. In fact, I'm yet to find a converter that takes that into account and anticipates lowering the level BEFORE conversion of. Reducing the level should not be an issue, for that matter, but normalizing to 0dB is quite risky - I've seen intersample peaks of +3dB on very loud songs! There's a lot to say about audio conversion, but one important (but neglected) thing is that any conversion can create so called "intersample peaks" thus creating distortion. So the statement that it "improves the quality" of an mp3 is simply false - you could consider it "improves" the mp3 file itself by suiting your need for normalization or else, but not "the quality". Hence the reason why I'm not making a proper review, if anyone prefers normalizing their files at the cost of a (probably) imperceptible degradation for them, let it be. I've tested this app just enough to be sure it was actually "converting" the file and yes it does. Also, the changes mp3gain makes are completely.10 answers Top answer: Take a look mp3gain which for me is even better than normalize-audiomp3gain -r. It would not be so if there was a setting in the file's metadata like "play level" that you could change instantly, but AFAIK this doesn't exist. Instead, it does some statistical analysis to determine how loud the file actually sounds to the human ear. As an audio professional, I can't recommend an app that alters files in compressed format (mp3, aac, etc.) as any conversion to a lossy format implies modifications and artifacts and is not advisable.
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