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The Buchla 100 series' dual control voltage processor (1960s), drawn in its San Francisco Tape Music Center panel: it "serves to mix, compress and invert control voltages. Each channel has two control voltage inputs and an internal voltage source. Particularly useful for obtaining fine pitch control, transposition capability, and range compression of control voltage sources" (the 100 series catalogue). Each channel's knobs and bare shaft stand on the printed ext and int branches.

Key features

• Two channels, each with two control voltage inputs, one inverting
• An internal voltage source per channel
• Mixing, compression and inversion of control voltages