Hey i dont know if this has been posted or not if it has im sry. but to fix the duplicate song problem,
download and install MP3tag
http://www.mp3tag.de/en/
when installed open it up, go to tools, then options. under options Mpeg
check everything like this,
http://s50.photobucket.com/albums/f3...titled11-1.jpg
Then go under the Ape, Mpc and check everything thing like this,
http://s50.photobucket.com/albums/f3...ntitled1-1.jpg
once u do this add all the music that is duplicateing and re-edit the meta data and save the changes
hope this helps everyone it fixxed all my duplicates and once again if this has been posted before im sry.