[sdiy] Additive Synthesis questions

[Joel B]

Is there no naturally occuring sine wave generation? Does a quartz  
crystal only make square waves? I'm wondering if there is any kind of  
cicuit that doesn't require wave shaping to generate a relatively pure  
sine... I mean all waveforms arease of sine waves right? So the sine  
wave must be the most common naturally occuring waveform, at least it  
would seem so...

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