The scene: The Roy Rogers, at Van Ness and Wisconsin. The time: 7:30 p.m. In among the pardners pile Paul Volcker, tall and terrific Chairman of the Fed, with Jerry Corrigan, President of the Federal Reserve Bank in Minnesota, and another smartly togged sidekick. Grinning broadly the trio loads trays (six sandwiches between Tall Paul and Jerry), trips over to the ketchup stand, chattering of interest rates. All through their simple but nourishing repast, the trio rubbernecks the price list and simply hoots with laughter. Then, they pile back into the car. Their driver whisks them off into the star-spangled night, to watch the NCAA final. Ear thought you should know . . . The time: 10 p.m. In the office of the chairman of the Securities and Exchange Commission, the phone's jangle smashes the silence. Chairman of the SEC John Shad, brooding over whatever they brood over, jumps. A woman's voice: "Arthur?" "No, this is the SEC." "Oh, you're not Arthur." "I'm afraid not. I'm John Shad, chairman of the Securities and Exchange Commission." "So sorry." Both hung up. A few minutes later, the phone jangled again. "Are you really the chairman of the SEC?" "Why, yes." "Well, will you please help me with my accounting homework? I need to know how to make a LIFO inventory valuation adjustment." Do not expect Ear to go into the details, please. It will merely give its usual hoarse hoorah for jolly John Shad, who did . . . Ed Pound, New York Timesman (and once of the late lamented Star) ankling over to The Wall Street Journal's bureau here, to fill the empty Investigative shoes of the late Jerry Landauer. Far more Friday.