For wave shaping from saw to spaced saw I kept the original circuitry from the Elektor Formant. I only have to change some part values due to the different signal level.

Waveshaper: Saw to spaced saw

New added is the saw to square waveshaper because I found it usefull to have a symmetrical square output.

Waveshaper: Saw to Square

The saw to pulse shaping is quite different to the original but quite standard.

Waveshaper: Saw to Pulse

Oscilloscope screenshots:

Screenshot: Saw to square and spaced saw

Screenshot: Saw to pulse