Radio-making isn't just for professionals. Every summer, several dozen people from across the country converge on the Center for Documentary Studies at Duke University to learn the skills of audio documentary work -- recording, shaping and crafting a piece, and mixing it on the computer. They get guidance and inspiration from seasoned producers. (They also tend to eat good barbecue and see a Durham Bulls baseball game.) This show pulls together seven of the best works made by those students -- many of them first-time producers. "Southern Slices" is hosted by CDS audio program director John Biewen.