A runthrough (with sound, but no narration) of some of the features of Sonic Visualiser. This rather low quality video (some of the audio in particular has suffered in conversion -- sorry!) dates from the end of 2006 and covers Sonic Visualiser v1.0.
The music is Ron Parker's mix of "Cold Duck" played by the Terrace Martin Trio, taken from the tutorial "Mastering with JAMin and Ardour" (http://jamin.sourceforge.net/en/tutorial.html).
Sonic Visualiser is a Free Software cross-platform audio analysis program from Queen Mary, University of London. See sonicvisualiser.org/ for more information, downloads, etc.