Here is the color wheel used by my electronic instrument, Abella. When the music box is playing “C”, the pitch display appears yellow. Middle “C” is set at 262 Hz, high “C” at 523, and low “C” at 131 Hz, and each is displayed yellow. The remaining notes occupy a RGB-CMY color space.
I think I like the color wheel even better as a “circle of fifths” :
Gregory Kimball 
Heh, are you Scriabin or something?
Just kidding about the Scriabin post; was actually looking for what people in the Atwater group in PV do after finishing their dissertation…