Now that I've arrived in the 21st Century, my kids think I know how to redeem iTunes gift cards. I don't want them to roll their eyes anymore than they do so I'll ask here. I get the redeem part and the card code. Is the balance after purchase automatically stored in the iTunes account or do you hold on to the card until it's empty? Thanks. AA P.S. You can roll your eyes too, I just won't see it.