Originally Posted by
OpenTuning 
If books sometimes sit on the shelf, then can I highly recommend you start your research on AVRT with the online Crash Course (just Google that for a link). It's free, and is the theory behind AVRT in an easy to follow way. I never did read the book, the online version did the trick for me.
Thanks for the reference! Never heard of it before, read it and loved it. It appeals so much more than "lifetime ongoing recovery that never ends". Of course, it's only a matter of personal choice.