A particularly attractive feature is the ability to synchronise a number of recordings so that you can jump from one to the corresponding point in another. There is a range of built-in visualisations such as spectrograms, again highly customisable, but an essential strength of Sonic Visualiser is its ability to support third-party plug-ins.
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source:http://linuxpoison.blogspot.com/2010/11/135781677518178.html