i bought these four christian albums on cd audio and then converted them to mp3s with my pc. when i play the mp3s in my pc it sounds fine. but when i play it with my portable mp3 player there is this odd voice, as if a second voice, which is like an echo. it's really iritating. but with cd audios, my mp3 player would play fine. i don't know if the problem is in my mp3 player or in the settings i put in my mp3 converter. any ideas?