[sdiy] tanh distortion in a filter

[Olivier Gillet]

> (in "duh" mode himself) - you mean like using a sine function as a transfer function
> for some signal path?  as in a preamp that disorts like a sine function from -pi/2 to
> +pi/2?

That's what I understood the first time, and I was thinking "that's
going to be a very colourful preamp", and then I realized that by
"sine shaper", David meant "any circuit which outputs a sine-like
signal from a triangle" (or how to get a sine VCO from a triangle
VCO...)