*** Unsatisfied criteria *** Criteria 8 The notation possesses a fully proportional pitch coordinate, where each of the twelve common pitches is spaced in a graphic manner, so that progressively larger pitch intervals have progressively larger spacing on the coordinate. ***
This I questioned (as "it it necessary!?" from the illustration above) to be somehow irrelevant requirement if there are going to be 12 distinctive noteheads for the 12 tones.
