The collection contains a few others, which were apparently issued as accompanying material to numbers of the "Gravesaner Blatter", a periodical focused on experimental and electronic music. Here are examples of a few discs published by Hermann Scherchen's "Experimentalstudio Gravesano" in Switzerland, covering techincal processes of electronic music, works by Pierre Schaeffer, and examples of filter experiments:
Unfortunately, some of the discs are showing signs of warping, or in one case, chipping.
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