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you might want to turn your computer into an audio OSCILLOSCOPE !
Several ways you can do this:
MacIntosh Shareware Programs
IBM PC Shareware Programs
Sound Sculptor Spectra Digital Oscilloscope Sound Effects SoundView
Java Programs Java Synthesizer: http://zerius.victoria.bc.ca/synth/ WaveView: http://www.ldc.upenn.edu/lol/greeting.html