Voice modulator/meta

The quality of the imitation is determined by the user's knowledge of the sound: for instance, if he has grown up with this sound since childhood, he will likely give a perfect imitation, whereas if he has heard it once on a semi-faulty tri-D screen, the quality will suffer. It is up to the referee to determine the quality of the imitation, and how likely the hearers are to be fooled. As an example, perhaps John, equipped with a voice modulator, wishes to scare some primitives with the roar of the Crested Jabberwock. He has only heard such a roar once, ten years ago: the quality will no doubt be awful, unless John has an incredible memory. However, the primitives will probably never have heard a crested Jabberwock before, and would be frightened by even the worst attempt. If, on the other hand, John is completely familiar with the roar, having once worked as a zookeeper, he will be able to give a faultless impression of the Jabberwock to even the natives of Kassan.