Sequential Circuits Six-Trak

Sequential Circuits Six-Trak Image

The Six-Trak is Sequential's beginner synth. It has typical Sequential sounds in an analog six oscillator, six voice synth. It is not fun to program, there is only one knob and you need to assign the parameter you wish to adjust to this knob. The assignment settings for the various parameters are listed in the center of the front panel. It does however feature MIDI with controllers for its parameters to make editing easier using a computer program such as Unisyn or other external MIDI controller.

Sequential Circuits Six-Trak Image

The Six-Trak features two operational modes: Polyphonic Mode and Unison Mode. In Unison mode, with all six oscillators, this baby gets fat, rich, creamy and wild making it an excellent stand-in for Moog-like sounds. Also, the Six-Trak is capable of interesting and complex sound effects, mostly thanks to useful cross modulation and the six oscillators. It also includes a simple 6-channel on-board sequencer (of little usefulness these days). Its biggest limitations were: shortest attack too slow for really percussive sounds, smallest vco frequency adjustment too big for Zawinul-style subtle frequency envelopes & LFO, and the lack of built-in chorus, which would have helped to thicken the rather thin sounds in Polyphonic mode. The SixTrak can be fun and cool but is overshadowed by its cousin - the Multi-Trak. It is used by Überzone and Cirrus.

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43 Visitor comments
April 20, 2010 @ 9:41 pm
this synth gets an A+ for great pads and strings and FX. i also love the build! very sturdy metal with the classic wood sides. I love the look of it as well as the preset sounds. i don't mind the rubber buttons at all. I like the fact you have to work those buttons over and over to tweek the presets! I will never sell it. The seq is cool as well though i don't use it much. glad i went into guitar center that day. i found and old gem perfect for industrial / gothic music! i bet one wont show up again...lucky me! even got the manual with it. the synth is in mint condition. paid $250 talked them down from $385. the only issue was a crackle in the volume pot that was loud and fuzzy as well. i complained about it to get the price down. hit it with deoxit when i got home and the noise is gone!.. ha!!!!
March 25, 2010 @ 8:20 pm
These performance complaints can be addressed through modification and circuit bending of the original six-trak circuits, ie.) capacitor value modifications of the LFO circuit, S&H's, envelope attack is a reactive component, and so the resistor and capacitor will produce the slope. Go with a smaller cap for quicker attack, or modify the pot value somehow. Chorus would be a feedback loop, with a summing amplifier, and a pot to control the feedback amount and volume, to which Lfo could be summed as well, producing much more variation in tones. See circuit bending on You Tube, maybe somebody has already done what you want and you can just copy them.
Lasse Storgaard
March 23, 2010 @ 9:02 am
Everytime I start this synth I think:"Hello Bladerunner".
It is true that it is very basic and there is no hands on control, so thank you to Chris for his comment.I think it's easy to program, because it really can't do that much.It's strings,moody wet or dry pads, shimmering fx are amazing.Also, I very much like its design - a compact 4 octave wonder.
February 21, 2010 @ 11:21 pm
This keyboard is awesome, and I am trying to implement the midi for each of the parameters to make it even better. I have programmed on my own and is quite tedious, but the sounds are amazing. The sequencer is awesome as well, as you can pretty much write songs with different patches! Only downfall is the sequencer is not very well timed, you can't really sync things like live drums to it. wondering if the multi-trak fixed that?

Note: I bought, and am now selling the Evolution UC33e which was suggested by another user. As far as I can tell this WILL NOT work (doesn't support sysex except volume & pitch bend). Behringer BCR2000 hopefully will work from what i hear on the forums...
February 1, 2010 @ 9:46 am
I like my SixTrak. I upgraded it to the newest ROM from With a Doepfer "Drehbank" (64 assignable Pots for Midi-CC-Controller) it really rocks. You can even twiddle two parameters at the same time. This way all parameters are at my fingertips. Some time ago I started to enhance it with 6 Audio-Ins and 6 Audio-Outs. But I never finished the mod, altought is wouldn't be too complex to do (with Op-Amps).
VSE Rating

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User Rating

Rated 4.01 (383 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - 6 Voice Polyphony and 6 part Multitimbral
  • Oscillators - 6 VCO's (sawtooth, triangle, variable width)
  • Memory - 100 patches
  • Filter - 24 dB/oct lowpass w/ ADSR envelope
  • VCA - Standard ADSR
  • LFO - Yes
  • Keyboard - 48 keys
  • Arpeg/Seq - Arpeggiator (up/down) and 2-Track sequencer (up to 800 notes)
  • Control - MIDI (all parameters are midi controllable)
  • Date Produced - 1984
  • Resources & Credits
  • Images from

    Additional info submitted by Jeff Learman.

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