On Thu, Jan 10, 2013 at 04:55:54PM +1300, Mayes, Kerry wrote:
> Hi all
> 
> I'm looking for some software that will display up to four sine waves added
> together.  My trouble is I don't really know what search terms to use!
> 
> What I am trying to demonstrate is the difference between
> equal temperament and just intonation - two ways of tuning in music.  For
> example, the note A is generally 440Hz, 880Hz, ...  A just tuned 3rd (Db)
> is 550Hz whereas the equal tempered 3rd is 554.37Hz (440 * 2^(4/12)).
> 
> So adding the just intonation sinewaves should give a regular looking
> pattern whereas the equal tempered will be a bit "messy".
> 
> If anyone knows of anything like this, I'd be keen to hear.

Maybe the 'superimpose multiple waveforms' function at

  http://www.wolframalpha.com/examples/AudioWaveforms.html

Malc
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