The sound identity element serves to compare sounds. When doing this, it is only judged if the matter in question is an identical data object of the sound type, the contents of the sounds being not compared. One or more sounds can be specified. The comparison takes place from the top downwards. The element returns a logic validity flag in case all sounds are identical. A special case is comparing one sound. The sound is compared with an empty sound, e.g. to test, if a valid sound has been readed from a file.