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The Buchla 100 series' twelve-key touch controlled voltage source (1960s), four panel units wide, drawn in its San Francisco Tape Music Center panel: "touch activated keys produce one of twelve preselected voltages at each of two outputs. A third output voltage is proportional to finger pressure, and a fourth output is a pulse generated whenever a key is activated. Generally used to initiate notes and control their pitches" (the 100 series catalogue). Twelve metal plates on a circuit board, two knobs over each key (its voltages at A and B), the outputs A, B and C on two jacks each and the trigger pulse on two red posts.

Key features

• Twelve touch plates
• Two preset voltages per key, at outputs A and B
• A voltage following the finger's pressure (C)
• A trigger pulse at each key touched