Bests & Worsts Reviews from Amazon

I can tell that this beautiful "secret code wheel" would be very helpful in understanding the note relationships that abound in music. However, the problem is that you have to already know the "secret code". The instructions with the wheel are minimal. The instructions on the website for the wheel were just as scant, if not more so. At least I couldn't find them. Even just an explanation of the abbreviations would be helpful. I realize they are more or less standard to those who already know them, but not to someone who is just starting to study music theory. I am setting it aside until the time when I have learned more. I am disappointed because I usually am able to learn a lot through visualizing relationships. But not this time. It is not just a more complete Circle of 5ths. It is a different tool, and for this beginner, not useful because of the lack of instructions for those with only basic knowledge of music theory.