Barry Champlain, Cleveland's controversial radio host, is on the air doing what he does best: insulting the pathetic souls who call in the middle of the night to sound off. Tomorrow, Barry's show is going into national syndication and his producer is afraid that Barry will say something that will offend the sponsors. This, of course, makes Barry even more outrageous. Funny and moving, off beat, outrageous and totally entrancing, Talk Radio had a long run at New York's Public Theatre starring the author.