Hi Laryn

> Actually the high-quality sine circuit is *quite* common. According to my schematic
> library, most vintage oscillators used this standard design. For example, my Aries VCOs
> produce a pretty good purity sine using this:
>
> http://www.leinermedia.net/aries/AriesSchematics/AR-317s.gif

Sorry, these are converters, but no sine oscillators. it is a sine-like
waveform, but not a sine. Every frequency modulation affects the core
oscillator, not the sine. So the result will be what the waveform
converter makes out of the fm'ed core waveform, but will not be a fm'ed
sine.

Florian