Pause is good for automating the mesurement of the duration and location of pauses for experimental purposes and for automatically fragmenting large recordings. The simple method it uses to detect silences is not appropriate for use as an onset/offset detector for speech recognition, where missing a short, low-amplitude fricative, for example, may have unfortunate consequences.
Pause uses libsndfile for audio i/o, so you must have this library installed on your system. You can obtain libsndfile from: http://www.mega-nerd.com/libsndfile