Designed in 1972 [Museum für Gestaltung Zürich] [Reichardt/Hoefer] and submitted to Letraset. Released in the Letragraphica range in 1974 [Daines].
See also Sonora, a variation with exclusively vertical stripes.
The digital version previously available from ITC is discontinued as of 2021. A new digitization authorized by Tissi will be released in c.2024 [Tissi].