--On 17 April 2012 22:26 +0200 Gregorio Garcia Karman <ggkar...@musicologia.com> wrote:

"[one person] controls the volume of the total output of the platform
speakers, as well as the stereophonic motion of the sound to and from
between the loudpseakers, and the spread or growth of the sound from
audio-point to audio- plenum"

Although it is no way an answer to your question, this puts me in mind very strongly of a live broadcast (and the rehearsal, which was better) that I recorded in 1969 or 1970 while at the BBC, of Treffpunkt from Stockhausen's Aus den sieben Tagen. Parts of the BBC SO were placed around Maida Vale 1, and asked to improvise to the guidance of a text that Stockhausen read to them first. Each group had some microphones, and in between the groups were speakers. Stockhausen sat in the middle with a mixer desk which enabled him to take the miked sound from each part of the orchestra and direct it to any of the speakers, or any combination, to guide or disrupt other groups of performers. Each part of the orchestra had another mixer desk at which an acolyte determined the combination of the microphones that was sent to Stockhausen's mixer. The performance took place in darkness, and lasted about 20 minutes (in final rehearsal, it had been 30 minutes, and with more form).

Paul

--
Paul Hodges


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