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Sequential Circuits Six-Trak

Analog Polyphonic Synthesizer

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Six-Trak 1Six-Trak 2Six-Trak 3Six-Trak 4
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Sequential Circuits Six-Trak
Sequential Circuits Six-Trak
800.00 street price

One of the world's first multitimbral synthesizers created to work together with a computer (Commodore 64). A computer program allows you to program voices, and together with Drumtraks you can get a complete MIDI system.

The architecture used in Six Trak is intrinsic to many synthesizers of the middle price range of that period: the microprocessor (Zilog Z80) controls an analog voice chip.

CEM3394 was used as a voice, which had a relatively small price along with high stability and satisfactory sound. Each such chip contains:

  • One voltage controlled oscillator (VCO) that produces triangular, sawtooth or pulse waveforms.
  • A four-stage voltage controlled filter (4 pole VCF) with the ability to set resonance, cutoff frequency and modulation depth. There is a keyboard tracking mode that allows you to create a sound typical of acoustic instrument voice (higher notes have a higher filter cutoff frequency and therefore more harmonics).
  • A mixer that blends VCO signals and a built-in noise generator.
  • VCA, which allows you to set the depth of modulation by the envelope generator, as well as the volume of each voice.

The synthesizer comprised two independent ADSR envelope generators, LFO (triangle and meander), a six-track sequencer (up to 800 notes), an arpeggiator and 100 patches for saving settings.

The synthesizer parameters could be organized better: all values are entered only with one controller, and all parameters are digitally encrypted (in the center of the front panel there is a table with decoding).

Six Trak can work in polyphonic or unison mode: in this mode, all six VCOs operate to create one note, this mode allows you to achieve "fat" analog sound.

Sequential Circuits Six-Trak was used in the songs of Überzone and Cirrus.

Country of origin / production: USA

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More info
Usage area
Usage Design/ Form Factor
With Keys 
Hybrid, Digital+Analog 
Analog Voices6
Tone Generator / Sound Synthesis
Oscillator Type VCO (Voltage Controlled Oscillator)
Oscillators' hard sync 
Oscillators per voice1
Waveform/ Spectral form (main generator) Pulse Width Modulation (PWM)
Waveform/ Spectral form (main generator) Triangle
Waveform/ Spectral form (main generator) Saw
Programs/ Voices/ Timbres
Voltage Controlled Filter (VCF) 
Low-pass Filter (LPF) 
Envelope Generator (EG)
Max Events Count800
Arpegiator/ Portamento
Arpegiator Mode Up
Arpegiator Mode Down
General MIDI (GM) 
MIDI in/ out
Type Synth Action
Number of Keys48
Display type TFT
Color resolution Monochrome
Built-in controllers
Pitch Bend Wheel 
Modulation Wheel 
Audio out
Analogue: 1/4" (6.35mm)1
Voltage 100-230(250)V
Voltage 50-60Hz
Power Supply Built-in, internal
Height114 mm
Width711 mm
Depth305 mm
Weight8.2 kg
Case/ body
Production start1984
Production end1985
Production ended

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Sequential Circuits Multi-Trak
/5 0

  Analog Polyphonic Synthesizer   900.00 U.S.Dollars

Multi-Trak is an improved version of Six-Trak. The basic architecture remained unchanged: six voices based on CEM3394 controlled by Zilog Z80 microprocessor. Among the differences there are: Enlarged keyboard. In Multitrack, the number of keys has been...