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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.