Keep voicings in the middle of the keyboard. Too low is muddy; too high is thin.
If you are looking for a complete, offline reference manual featuring keyboard diagrams, grand staff notation, and step-by-step transposition exercises for all 12 keys, you can download the full handbook.
The PDF was only 14 pages. No notation. Just diagrams. The thesis was absurdly simple: “You have two hands. The non-pianist has ten thumbs. Ergo, use one shape per chord.”
