Do you listen to the radio? watch television? go to the movies? Then the chances are you've heard the voice of Mae Questel, director of activities at the Hollywood Hotel, Long Branch. But you've probably never seen her. "I'm heard but never seen," says Miss Questel just the reverse of the old adage. Miss Questel 1st the "voice" of Paramount Studio cartoon characters: Little Lulu, Olive Oyl, Little Audrey, Casper and the Friendly Ghost, and Betty Boop. She also does TV commercials for Duz, Fab, Ivory Snow (she's the voice of the snow man, Colgate's Dental Cream, Clark's candy bar, Scotch tape. "Whenever they want something odd, unusual, or weird, they call on me." Radio listeners have Miss Questel as Miss Duffy on Duffy's Tavern and '"Hortense" of Hortense and Gerard on the Henry Morgan (how. She's also played on the True Story, Mr. and Mrs. North, Perry Mason, and The Goldberg shows. There's one exception to the heard-but-never-seen rule. Miss Questel recently made a series of television movies with Melvyn Douglas. These are currently on view as the "Hollywood Off-Beat" mystery program every Thursday - with an illusion neckline and hoop skirt. Making a movie cartoon is "a piecemeal job," Miss Questel confesses. All the work is done in the Paramount studios in New York City. "In fact," laughs Miss Questel, "the only time I've ever been to Hollywood is this summer." That was before "Betty Boop's" time. Miss Questel herself was the model for Betty Boop, she reports. The cartoon character mimics her own gestures; "Betty's" fare is a caricature of Miss Questel's. After the summer season at the Hollywood where she serves as entertainer, mistress of ceremonies in the Hollywood Shell Room, and manager of guest and manager of guest relations she will head back to New York City and Paramount studios with Mrs. A. Edward Risch- referring to her Job at the West End resort hotel. A cartoon gets under way when a rough draft of a script has been prepared. Miss Questel's job is tops on the agenda, for the pictures aren't drawn until the voices have been recorded. Last of all come sound effects and music. Paramount employs 250 cartoonists, Miss Questel affirms. Yet the output is only about three cartoon shorts a month. That is because each of the thousands of shots in a cartoon must be drawn as a separate picture. Complicated as this business is, it used to be even tougher. Miss Questel will tell you. When the animated cartoon business began.