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Looper's Delight
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you mean he performed solo, or the piece was called solo? ;-)
He had a big disc with sound waves drawn on it in the same
way that movies use an optical soundtrack.
This allowed him to speed up a loop so much it eventually became
a tone ( not easy to do well even with digital editing).
A much greater range of pitch than possible with tape loops.
"...there were loops running everywhere, and you could see it through the glass windows between the studios. Finally I used the fast-forward on the tape recorder to accelerate the tapes so they were already four or five octaves up, then the result went up another four octaves - so then I was up eight octaves - until finally I got into an area where the rhythms were heard as pitches and timbres."
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