From the original manual:

"Produces a sequence of two to eight programmed voltages at each of three outputs. Switching is accomplished by applying a pulse, usually from a Model 140 pulse generator. Indicator lamps show which of the 24 potentiometers are in control. Eight pulse outputs are energized as corresponding segments are switched. Unit may be used to simultaneously program pitch, amplitude, and duration of single or repetitive sequences of notes."

123 Sequential Voltage Source PCB

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