There are three new BASS MATRIX videos in which a few groove aspects from the Bass Matrix are explained briefly and concisely with beautiful animations. Take a look: https://bassmatrix.org/videos/
The first is about the core of the bass matrix. The second is about the & bass options you have for each drumbeat (i.e. based on Toolbox 3 in the book) and the third shows how you can transform a bassline into other rhythms and meters.
Take a look and feel free to share!