Of cyclotrons and sequencers: recreating a 1974 “probability controller” in Eurorack

video upload by Electrum Modular

"This is the first video in a new series exploring the University of Iowa’s Electronic Music Studio. In addition to presenting its historic instruments (including a 1968 Moog IIIP with custom-made modules), and the famous musicians who have used them, these videos will extrapolate ideas to use in your own modular systems. This episode examines a unique random sequencer that was developed in 1974 by Paul Dingman, an electrical engineering student at Iowa. It then shows how it might be recreated using the third lane ('time') on Make Noise’s 0-Ctrl. NOTE: several other Eurorack sequencers also have this feature, as indeed does the Moog’s own 960 sequential controller; alternatively, use an LFO to clock any sequencer and patch the sequencer’s second lane/channel (if it has one) back into that LFO’s frequency input.

0:00 University of Iowa's Electronic Music Studio
0:42 Introducing Dingman's Probability Controller
1:58 Demonstrating the Probability Controller
3:50 Recreating the Probability Controller in Eurorack

My new album:



CREDITS

Thanks to Paul Dingman for answering my questions over Zoom.

Film sequences:
'Atom Smashers' (Encyclopaedia Britannica Films in collaboration with the Division of the Physical Sciences and the Institute of Nuclear Studies at the University of Chicago, 1952)

'The Meaning of Time In Science' (Encyclopaedia Britannica Films, d. Kent Smith, 1973); both archive.org

Portrait of Peter Tod Lewis: https://composers.com/collections/pet...

Music: Peter Tod Lewis, 'Gestes II' (1974), from the Mnemothèque Internationale des Arts Electroacoustiques (University of North Texas Music Library). Program notes for an EMS concert on April 13, 1979, described “Gestes II” as “the generation of musical gestures through coordinated operation of sequential controllers programmed to produce a large but finite collection of voltages, controlling variously oscillators, amplifiers, and filters” (University of Iowa Music Library)."