[Frameworks] Optical sound – Structural film

[Albert Alcoz]

Hello,
Does anybody know structural or structural-materialist or minimal/abstract films from the sixties or seventies where the sound of the film comes directly from the graphic treatment on the optical sound area of the celluloid?
Kurt Kren drew a line with ink in his film Trees of Autumn (1960) and Guy Sherwin shot pictures on the variable area of the soundtrack. Those films were collected on the Optical Sound Films (1971-2007) DVD.
I thought the soundtrack of Roh Film (1968) by Birgit & Wilhelm Hein was done directly from the collage materials attached on the surface of the emulsion but it is not. It was done afterwards, as an autonomous noise piece by Christian Michelis. 
I'm thinking about films like Dynamo Dresden (1971) by Lis Rhodes or Soundtrack (1969) by Barry Spinello, but they are more abstract animation pieces following the visual music tradition than the structural or systemic patterns.
Any suggestion will be appreciated.
Thank you very much,
Albert Alcoz-- 
http://visionaryfilm.net/
http://albertalcoz.com/


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