[sdiy] Additive Synthesis questions

[David G. Dixon]

> The Buchla 148 harmonic generator creates a fundamental triangle wave, and
> then goes through a bunch of contortions to shape that into the remaining
> 9 harmonics, in triangle form. Each of those 10 is shoved through a
> double-diode-FET-type triangle-to-sine shaper. The results are definitely
> far from pure, which winds up being far more interesting to work with in a
> Buchlaish context than "pure" sign waves.

Aaron, do you have a schematic for this circuit, or even a description of
how it actually works?  I can't seem to find anything definite on the web
except vague descriptions of the module itself...