Also, I wanted to say that I realize my reply was pretty "bare bones"
and perhaps not too informative, but that was really all the book
said. There was one sentence dedicated to it. Having said that, there
are a number of exercises in the book, such as some of his jazz lines,
that shows you how he alternates T and M (thumb and middle fingers).
It's not a big book --- about 36 pages, but it is still informative
and shows you how he thinks about this stuff. Kevin has long been one
of my favorites.