1. Record an audience listening to a blank cassette tape
on full volume. End the recording when a member of the audience reacts.
2. Record a new audience listening to the recording of the first audience listening and reacting to the blank cassette tape. End the recording when a member of the audience reacts.
3. Repeat step two until the blank cassette tape consists only of reactions to a blank cassette tape. New audiences may react before or after previous audiences.