Harmonics question

[Ethan Robert Duni]

>Simple experiment to get a waveform with only even harmonics:
>
>Take an odd harmonics waveform (Say at 880 Hz) add a sine at 440 Hz
>and voila! You just got yourself an all-even harmonics waveform.
>I don't think that it will sound particularly earth-moving, but yeat
>usefull. If you synk or PLL the odd-harmonics waveform to be at the
>double frequency of the sine you can get it to track up better.

-has anyone ever tried taking a function with only odd harmonics and
subtracting it from another function of the same frequency to increase the
strength of its even harmonics? would have to add the fundmental back in
afterwords though, i suppose..
Ethan Duni