As said before i loosely follow the Elektor Formant path with my circuitry. So I did with the waveshaper for my Next Generation Formant, NGF. It will have 10Vpp saw input from my NGF VCO and saw, spaced saw, triangle, sine, square and pulse output, all 10Vpp. This follows the original. I only added the square output.

Waveshaper Block Diagram

I changed some of the circuitry for better performance, particularly the saw to triangle and triangle to sine part. And did a lot of breadboarding.

Waveshaper Breadboarding

Building and testing the prototype on stripboard.

Waveshaper prototyping