Having Just Watched The Film 'Dont Look...
ChatterBank3 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.This might be a start:-
http://www.mymusictools.com/download/normalise/
But check the next time you create the mp3s to see if there is a normalise option the. Also Nero should have a normalise option.
Check out the free program 'Audacity'.