Genetic key:
E = black (can produce black pigment)
e = red (can't produce black pigment)
Black (E) is dominant, so just ee will produce only red pigment
A = agouti, or bay, restricts black pigment to points. Only shows on horses with at least one E for the black points; if there is no black pigment, there is nothing to restrict, so ee (red) horses do not look any different no matter their agouti status
Agouti is dominant, so Aa = bay also, if at least one E is present
aa = not bay, does not restrict black pigment if present (E_/aa is the only way to get a black horse)
Any letter with a _ next to it, such as A_, means it has at least one dominant gene present and the other can test either or and not affect the color. For example, E_/A_ will always be bay, whether it tests EE/AA, Ee/AA, EE/Aa, or Ee/Aa
Each base color is used for the foals: red, black, and bay, all + roan. Yes, bay is considered a base color! It was the original color before just red or black existed, all original early wild horses were EE/AA/DD (bay dun). Only later were there red and black horses.
The first split adult outcomes revealed of each were simply the base + roan, and possibly plus a pattern.
The other splits were meant to be sort of twists on the first ones.
Plus, spots! Roan can have "corn spotting," which I added to every true roan outcome, but corn spotting is not an actual pattern or gene. It is caused when the horse gets a knick or cut or other injuries to the hide. The hair will grow back completely pigmented and without the white ticking. On the black varnish, however, the spots are caused by the appaloosa pattern, which is why they are in a more typical appaloosa formation rather than randomly scattered and shaped.
So there you have it! Roans with a twist. Maybe some of you found this informaton interesting :)
Thanks to you I have now a little more understanding of the black magic called horse coat genetics! 
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. A store doberman would be amazing.
