The Audio Recognizer and Video Recognizer tabs provide a user interface to recognizer components that have been installed as extensions. These recognizer components generally apply pattern recognition algorithms to automatically detect events of interest (pauses, speaker turns, utterances, gesture phases etc.) in an audio or a video file. There is one audio recognizer included in the ELAN distribution, the Silence Recognizer (seeSection 5.4.3). More information on how to interact with the recognizers will be included in this manual at a later stage. The AVATecH project page (http://tla.mpi.nl/projects_info/avatech/) can be consulted for more information (including an interface specification).