Dick Mills was in charge of sound effects and all the rest then, and he put the voice through a ring modulator or whatever gizmos he'd got at the time to make it sound a little more electronic.
“Recent studies have revealed that children 8-10 years old are being diagnosed with Type II diabetes, high cholesterol, and high blood pressure at an alarming rate.”
“What a house. Turns out they're doing OK, the Malfoy's. However, the interior decorating leaves a lot to be desired. And needless to say, Voldemort isn't the greatest houseguest.”