By Bob Deakin "Let me have some coffee and then I'll listen," said a groggy voice-like that of a mother to a child who rises early and eager on a Saturday morning. It was 1968, and the voice was that of Frank Zappa, who was speaking from his bedroom to Dennis Dunaway and his band mates who were outside the door. Mr. Zappa got his brew, gave them a listen and essentially agreed to sign them to his record label that day. It had been a long dark road to getting there, but the Al