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+XAnalyser is a program to analyse a stereo audio signal. It has two displays:
+
+Frequency Spectrum
+Using Fast Fourier Transform, the time domain of the signal is transformed into
+the frequency domain, i.e. the amplitude (in logarithmic scale) of the
+audio signal is plotted versus the frequency. Either the sum of the 
+left and right channel of the audio signal can be shown or both
+channels simultaneously.
+
+XY Scope
+Roughly speaking, the audio signal of left channel deflects a point
+horizontally and the right channel vertically (just as the beam of a CRT
+would do). Thus, an audio signal only present on the left channel produces
+a horizontal line, whereas an audio signal only present on the right channel
+produces a vertical line. A mono signal produces a 45 degree line.
+A stereo signal creates a wilde pattern (if the phase is correct,
+predominately in the same direction as a mono signal) or may even fill
+the entire scope. 
+
+WWW: http://arvin.schnell-web.net/xanalyser/