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Sequential Circuits Model 700 Programmer Overview Back in 1974 Sequential Circuits was a small music technology company based in San Jose, California and run by Dave Smith from his apartment. The initial product was the Model 600 analog sequencer, followed in late 1975 by the Model 800 digital sequencer. Dave and new recruit John Bowden (x-Moog) then went on to create the Model 700 Programmer in the spring of 1977. The new product provided rudamentary patch memories for analog mono-synths like the Mini-Moog and ARP 2600. The table top programmer had 64 memories of 3 control voltages to drive the VCO's and two DADSR envelopes to drive the VCF and VCA of the partner synthesizer. In 1977 this was a major step forward, with only Oberheim providing patch memories on its 4 and 8 voice synthesizers. The Model 700 makes use of CMOS digital chips and early RAM chips, Dave didn't use the newly available Z80 microprocessor. That would have to wait until the design of the Prophet 5 later in 1977 and the influence and support of Dave Rossum at E-mu Systems. Mark 1 -- Dave launched the Model 700 in early 1977 and went on to sell one a week, mainly in the USA, for a few years. Here is a Mark 1 model, all the knobs are large, there are no CV trimmers on the top left hand panel and the patch switches are engraved with numbers. The record switch is part of the right hand lower toggle switch... Description -- The Model 700 has 3 independent control voltages for controlling the pitch of the partner synthesizers VCO's. Each pitch is controlled by a rotary potetiometer, and a single external control voltage from a keyboard can be optionally added into each pitch with 3 toggle switches. The pitches are quantized to semitone values. Two envelopes can be programmed with the usual ADSR and an initial delay - very Dave Rossum! The envelopes are triggered from gate or trigger inputs, usually from the external keyboard. The envelopes are designed to drive the VCA and VCF of the partner synthesizer directly. Each envelope has its own VCA so that the envelope volume can be controlled from the 700. There is an additional offset control for envelope 2, so that the initial VCF cut-off can be set too. Memories -- Once a patch has been set up with the programmer you can store it into one of 64 memory locations, selected by 8 switches (Programs) and a rotary switch (Banks). A red Record button is partially sunken into the control panel, which means it is not accidentally pressed.."
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