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Sequential Circuits | Model 600


The Model 600 was Dave Smith’s first-ever music product, a 16-step analog sequencer, born out of Dave’s desire to create a sequencer for his own Minimoog. A handful of these devices were sold to electronic music labs, and thus began Sequential Circuits.

Setup as a Sequencer

Three rows of 16 controls, each row with its own output. There is Built-in sequential control for up to 48 note sequences by turning only one knob. Voltage controlled clock can be set internally and/or controlled externally. Patch one output row back to the VCO input, and the length of each note can be precisely controlled. 

The 600 can sequence slower than one pulse every 30 seconds through and beyond the entire audio range. Any one level can be skipped by simply throwing its corresponding switch; hence, any combination of levels can be set. 

A direction switch for forward or backwards direction. Handy three-way mixers at the output for easy patch changes. Handy LED (light emitting diode) off visual display of sequence movement. 

Switch trigger output compatible with Moog synthesizers, including the Mini-Moog. By flipping one switch, gate and trigger outputs can be obtained for other synthesizers, such as the ARP 2600. 

As A Complex Waveform Generator

The quality of the Model 600 makes it possible to be used as a complex waveform generator, with up to 48 segments constructing the composite waveform. Below is an oscilloscope plot of a 48 segment sine wave at 300 hertz, with the lower wave-form the output after being run through a low-pass filter. 

One can easily see the possibility for complete waveform control. With an internal adjustment, the external input can be adjusted to the standard 1 volt/octave; hence, the sequencer can actually be played as an oscillator by any keyboard. 

This capability makes the Model 600 an excellent teaching aid for electronic music, as well as a quality waveform generator for the perfectionist synthesizer performer.
BrandSequential Circuits
ModelModel 600
Engine TypeAnalog
Voices (max)1
Engine Detailed1 VCO. In Oscillator mode allows for 48 (3 x 16) segments to be tuned as a single waveform.
Sequencer3x16 or 1x48 step sequencer
Key typeN/A
CV-gateCV/Gate I-O
Produced:1974 - 1975
Legend: Obvious Y: Yes, N: No, N/A: Not Applicable
VCO Voltage Controlled Oscillator DCO Digital Controlled Oscillator
LFO Low Frequency Oscillator Sub Sub Oscillator
VCF Voltage Controlled Filter VCA Voltage Controlled Amplifier
Velocity As with a piano, the harder you hit a key, the louder the sound, unlike most organs which always produce the same loudness no matter how hard you hit a key. Aftertouch Pressing a key after you activated it. Channel Aftertouch, no matter which key, it will send a Channel message. Poly Aftertouch, sends the pressure per key instead of the whole channel.
Values for OSC, LFO, Filter, Envelope are per voice unless stated otherwise.

Manuals, patches etc.


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