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The Buchla 100 series' frequency shifter (1960s), drawn in its Buchla Associates panel: it "shifts frequencies contained in input signal by an amount equal to the applied carrier frequency. Raised and lowered signals are simultaneously available" (the 100 series catalogue). Two outputs give the sum, two the difference; two inputs, and two cream jacks low on the face that no caption names.

Key features

• Shifts every frequency of a signal by the carrier's
• Raised (sum) and lowered (difference) signals at once
• Two outputs for each