Sequential Circuits Model 700 CV Digital Patch Programmer - 115-230V

The Sequential Circuits Model 700 is a digital patch programmer designed to store and recall control-voltage (CV) and gate settings for analog synthesisers. It effectively acted as an external digital memory unit for pre-MIDI analogue synths such as the Prophet-5 Rev 1/2, Minimoog, OB-X, and others that lacked patch storage. The Model 700 provided 64 user-programmable memories and can output up to six control voltages and two gate/triggers simultaneously, allowing it to control multiple parameters like pitch, filter cutoff, and envelope depth.

The unit features a numeric keypad, a small LED display, and real-time editing capabilities via panel knobs. Internally, it used a Z-80 microprocessor and stored patch data in static RAM backed by battery. It communicated using standard 1/4-inch CV and gate jacks and could send complex multi-parameter control data to compatible instruments, essentially serving as an early form of analogue preset management. Although quickly superseded by the arrival of MIDI in 1983, the Model 700 remains a fascinating transitional device that bridged the gap between pre-MIDI analogue and digitally controlled synthesisers.