The German Pavilion
The German Pavilion at the 1970 Expo in Osaka was an elaborate spatial audio project. Various artists, including Bernd Alois Zimmermann, Boris Blacher and Karlheinz Stockhausen, contributed works for the spherical loudspeaker setup:
A device for live spatialization in the Osaka Pavilion was developed at TU Berlin.
The following sketch shows Stockhausen's approach for working with the system, using an 8-track tape machine: