Tones of Entrances of calls and Messages very low

Have a Samsung Galaxy Young Duos S6102, but results that hardly ever I perceive when it goes in me a call or a message because his tones are very low to weigh that I have it to the maximum volume, have tried to put him songs or #another higher tone and have not attained it, do not find the way to change him the tones that brings of factory, would be possible that explained me if possible attain this that want and explained me how attain change the tones that brings of factory and put him the melody that I wish?

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