So I thought I'd share this. No desire to build one but someone might enjoy it:
http://www.musicfromouterspace.com/analogsynth/YOUR_FIRST_SYNTH/YOUR_FIRST_SYNTH.html

 

Hello,

I have seen the site long ago.
I sometimes use the site for handing out schematics for VCA or VCO's.
http://www.musicfromouterspace.com/analogsynth.php?page=ANALOG

I also have some idea's for the WSG oscillators:

By making the up and down going signals variable there will be much more possebilities.

Bertus