The official website of the aforementioned book: http://www.virtual-sound.com/en/
Forum is not very active but the authors are there to answer serious questions and inform on errors in the first edition of the book.
The book will take you through the basics of dsp as it relates to max/msp actually focusing more on the max side of things for the most part in this first book and they made the decision to test the readers knowledge through technical challenge type exercises. They do not provide solutions to these as the goal is to think for yourself and come up with the best solution.
There are other sources of dsp technical knowledge online but this series plans to focus on max/msp and imo may be very helpful for users of live who like to tinker.
I have the book myself and plan to go through it when the winter kicks in!