For all sine wave obsessed folks on this list here's some more for you
to read

http://dubshot.blogspot.com/2008/10/basswatch-3-cult-of-sine-wave-enter.html

especially the links to a sinewave shootout and an article by Bernie
Hutchins under 'Digital vs. Analog'

> Can someone give me an example of an application that requires a
> perfect sine wave

obsessively clean ring modulation if you really want to get rid of the
harmonics just filter the damn wave. otherwise go digital

> Another question... why is it that people ascribe a certain sound to
> modern modulars Why a certain sound to vintage

a very coloured and personal comment: why do audiophiles exist why are
certain people convinced that the sound quality of their stereo improves
if they use cable that costs 500 euro per meter

I don't understand

> why a modern modular can't sound exactly like a Buchla, or a Serge, or
> a fluglehorn, or a pile driver. In theory, with the all of the sound
> generating and conditioning elements of a modern modular in place, you
> should be able to make any sound.

don't forget that a certain circuit can have a certain unique quality.