I just wanted to say that as a newcomer to parametric composition and Opusmodus, Nigel's book has been so helpful. I have it as a pdf in the Utilities section of Opusmodus and work through a chapter a day and copy and paste his code directly into the Composer.
I know Nigel wrote the tutorials, but his book sets a wider context which I have found very helpful in this beginning stage.
Recommended!