The intro to the article notes that this was based on a design by Waveform Processing, which was run in part by the late Ray Wilson who was the man behind MFOS!

The intro to the article notes that this was based on a design by Waveform Processing, which was run in part by the late Ray Wilson who was the man behind MFOS! His site even hosts the instruction manual for the WP-20: https://musicfromouterspace.com/analogsynth_new/THE_CAVE/WP20/WP20_PG1.html https://musicfromouterspace.com/analogsynth_new/THE_CAVE/WP2....