"The Harmonic Minor Scale and its Modes for Seven String Guitar." has just hit Amazon in print and kindle formats.
This is the second volume of, "Basic Scale Guides for Seven String Guitar."
It's rammed full of 3 and 4 note per string options so you can fly around the neck.
There will be a lot more to follow as well as matching volumes for eight string guitar.
There are a couple of free sample pages below, but please click the links and check out the content on amazon
or just search for title on amazon in your country:
"The Harmonic Minor Scale and its Modes for Seven String Guitar.