Public Radio Exchange (PRX) and a trio of prominent women producers called “Launch” will field the two teams competing in CPB’s Talent Quest, the corporation said this week. Launch includes Mary Beth Kirchner, Julie Burstein and Marge Ostroushko. PRX, which is run by a bunch of guys, frankly, plans to choose its talent through four elimination rounds on the Web. Each team will choose three potential pubradio hosts (to be announced at PRPD in September) and work with them on pilots. The winner will be announced early in ’08. CPB will lay out the contest for the public Feb. 28 on the set of Austin City Limits. This FAQ explains the plan.