 The sounds most commonly used in Kouji tend to be those of animals, such as birds or dogs, but with the advancement of technology, Kouji has also come to incorporate imitations of busses, planes, and modern weapons.It is also now common to use a microphone in the performance of Kouji.Often the Kouji of a highly skilled performer so accurately mimics real life sounds that if the audience were to close their eyes, they might not be able to tell that the sounds were being produced by a human.