I am trying to sync my ipod with all of the old songs from my itunes account i used on our old computer that are already on it, with my new computer's library that i just set up. I have turned on home sharing and it still won't let me sync it I keep getting a message that I have to erase all the songs from my ipod in order to put the 11 songs i just purchased on there? That seems weird and unnecessary! Please help! thanks!