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Like his better known Klavar notation, Pot’s 6-6 notation is oriented vertically and is read from top to bottom (as shown on the right). Pitches ascend horizontally from left to right like on a piano keyboard. Pot designed this notation to correspond to a two-level 6-6 keyboard that he built.
His standard staff is shown on the right, with seven lines spanning two octaves. Every third line is bold which helps differentiate them. There are conflicting accounts about which notes the lines represent. The bold lines may represent C#/Db as in the staff on the right, or they may represent C (as described by Albert Brennink in his Chromatic Notation, 1983).
Earliest documentation: 1972 (in an article in Klavar-Nieus, a Dutch newsletter)
Source: Directory of Music Notation Proposals, section/page: 13/68