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Six-Trak

KeyboardAnalogPolyphonic

One of the first multi-timbral synthesizers ever made, this 1984 gem let you stack six distinct analog sounds in one compact box, revolutionizing how musicians sketched out layered arrangements on the go.

At its heart are six voices, each powered by a CEM3394 chip handling a single analog VCO with sawtooth, triangle, and variable-width pulse waveforms—mix them for rich timbres—paired with a resonant 24dB/octave low-pass filter from a CEM3372, plus software-generated LFO and three ADSR envelopes per voice for osc, filter, and amp control. Glide and PWM add expressive motion, while the 49-key velocity-sensitive keyboard (no aftertouch) pairs with pitch/mod wheels and a single-knob editor displaying params on a simple LED readout. It's got an 800-note six-track sequencer for multitimbral sequencing, arpeggiator, 100-patch memory, MIDI In/Out, and a lone stereo audio out on its 28-inch-wide, 17.5-pound portable frame.

Players love its gritty, warm analog character—think fat Jarre-style pads or speaker-shaking unison leads—plus the sequencer's creative workflow, though some note the digital interface feels dated next to knob-per-function designs, and heavy MIDI use can glitch the display. Still, its raw vibe keeps it a go-to for vintage enthusiasts chasing that classic Sequential punch.

Released

1984

Status

Discontinued

Synthesizer
Format
Keyboard
Type
Subtractive
Internal Battery
No
Voice
A/D
Analog
Polyphony
Polyphonic
Oscillators
1
Oscillator Type
VCO (Voltage Controlled)
Voices
6
Filter
Lowpass, 24dB/oct (4-pole)
Envelopes
3
LFO
1
Effects
No
Expression
Aftertouch
No
Velocity
-
MPE
No
Additional
-
Software
-
I/O
Audio In
-
Audio Out
1x 1/4" mono
Headphone
-
MIDI
In, Out
MIDI Type
DIN (5-pin)
Ports
Footswitch
Wi-Fi
No
Workflow
Arpeggiator
Yes
Sequencer
Yes
Mod Matrix
-
Memory
100 patches
Measurements
Dimensions
28 x 11.75 x 4.25 inches
Weight
18 pounds
Last updated Mar 21, 2026