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The Buchla 100 series' dual random voltage source (1960s), drawn in its San Francisco Tape Music Center panel: it "produces two uncorrelated, random output voltages, each of which is changed by applying a trigger pulse. Used to randomize frequency, amplitude, and time" (the 100 series catalogue). Each source has a red trigger input and two black outputs.

Key features

• Two uncorrelated random voltages
• Each changed by a trigger pulse
• Two outputs of each