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!

Nigel Morgan blogs have now been successfully migrated to this address:
http://tonalitysystemspress.co.uk/?cat=5