ipod volume too low

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Ok i have an ipod nano....sadly i can barely hear the music for most of my songs in the house let alone outside. I have tried to increase the volume via edit preferences, this hasnt helped much. So guys can you advise me as to how to best improve my volume and make my ipod better? Also...I have noticed that some of my songs are at negative decibel values....is something wrong or..well I dont understand lol. Any help would be greatly appreciated.