To push behind the dog sled and run in front of the dog sled. That was always an interesting job.
If you just did a horror tone throughout an entire movie you almost, as an audience, can get a little bit used to it. But if you're laughing one minute and, you know, somebody's doing something quite horrific the next minute, it's a little more shocking.
Whereas Schaeffer and Henry were working like samplers, their idea was to capture those sounds which couldn't be serially calibrated because they were too complex in character.