Do the same with your feet when you work it on a kit. Then you can "hear" the pattern.
I think this is very important for getting moving with this book. Trying to just repeat the patterns straight off the page without being able to actually hear them makes it a very difficult and tedious process. If you can hear them it makes a whole more sense, it makes it a lot easier and it also sinks into your playing much quicker.
Using two different voices is very important I think and this was great advice. Hopefully, you actually have a kit to practice on because I think it's highly beneficial to practice this material on a kit. Also, try to
sing every pattern. Understanding this material as melodies between the limbs instead of just random patterns will really help your understanding and help you take it to another level.
Make sure you look at the pattern (every pattern) first
before playing it, try to sing it in your head so you're hearing it well and then slowly put it together. This whole book is a slow process,
but, this is truly one of the instances in which the journey is a hell of a lot more important than the destination because it is the journey in this case that will make you a better player rather than the destination. Being able to play the patterns (the destination) is the eventual goal obviously, but it is really the ability to be able to put your limbs together in any which way you please in order to express yourself fully, which is where the journey comes in. This book is all about learning how to play anything you hear by having no trouble playing anything with all of your limbs together or individually, and just simply being able to play the patterns is not as important as having your body/mind able to
hear and understand the music or melodies that you want to express as the entire goal of the book is to that end.
So, saying all of that, take each section and pattern very slowly. Break it down as it suggests as the start by playing each part individually first and then add them together. I would suggest seriously spending at
least three minutes on each pattern at the start. In terms of the first pages, each pattern is a two bar phrase in eighth notes. Play the first bar for one minute, the second for one minute and then put them together for one minute doing it slowly and focusing on the
sound. Try to think of each one as a melody accompanying music. So, you're playing a linear melody with your limbs. It makes it much easier when you think of these as creating music instead of just playing random patterns that increase your coordination. You will also remember them easily the next time you come back to them as it will have meant something to you, apart from just being limbs in a different order.
In summary, I think this is one of those books that you need to take section by section and do each one separately before moving on to the next section. Spend a minimum of two months on each section,
at least[/I,] and a minimum of three minutes with each pattern really internalising what you are doing with them. If you follow this kind of practice you will gain immense benefits from going through it. By hearing them, most of all you will have fun. Good luck.