RamonFHerrera, you have previously told us that you are a complete novice with audio, and although you say that you have been studying noise removal techniques for the past couple of weeks, that does not make you an expert. While I applaud your enthusiasm for the subject, I don’t think that you are yet in a position to be able to advise other Audacity users. If you were fully familiar with Audio Diff Maker and understood how it works, you would realise that your suggestion to Kman2015 is nonsense and will not help him to achieve his aims. I would therefore respectfully request that you desist from misguiding other forum users.