[sdiy] Single chip (3 opamp) wave multiplier

[jh.]

> It looks somehow similar and sounds somehow similar to me.
> But we all know that things that sound allmost the same have no
> mathematical link, so there is only some little hope...
>
> I must confess that the math close to Bessel expension is very hard
> for me, and the math beyond is way over my head.

Same for me. I fear I will not dig deeper into this mathematically either.
FM is not the ultimate goal for me to approximate anyway. I want the
shapers to sound good, and the CVs to be able to fade beween various
interesting sounds, and that's what I'm going to develop further.

JH.