[sdiy] What book is this ladder filter from?

[Oakley Sound]

 > as opposed to another book by him, 'Electronic Synthesiser [sic]
Projects', for which the cheapest copy I saw was $82, and another is 
going for $250 !! Madness!

It is indeed. It wouldn't so bad if the book was actually good and the 
circuits actually worked. But its incomplete and the circuits are full 
of errors. Awful book in my opinion.

Tony