audiobriefs
9:59in productionCh. 1 · Affordable Polyphony/ 9:59 · ceiling 15 min
Synths & drum machines

Korg Polysix

The Polysix trades oscillator depth for chorus width—and wins the argument for 1981.

The Korg Polysix is a 1981 six-voice polyphonic analog synthesizer designed for affordability through single-oscillator-per-voice architecture, compensated by built-in bucket-brigade-based chorus/phaser/ensemble effects — features that were relatively uncommon at launch and contributed to its accessibility and sonic richness.

Chapters & takeaways4
  1. 0:52
    Affordable Polyphony

    It was the first £1,000 polysynth—and it got there by cutting oscillators, not corners.

  2. 2:31
    Single-Oscillator Architecture

    One oscillator per voice—saw, pulse, or PWM—means less stacking, more focus.

  3. 3:42
    Chorus as Core

    Its bucket-brigade chorus wasn’t an add-on—it was the compensation, and the character.

  4. 5:38
    Built-In Utility

    32 patches, cassette backup, and arpeggiator: all built-in, all essential.

Worth your time?

Yes. Use the whole thing.

4/ 5
What works
  • delivers thick, organic chorus unmatched by early digital effects
  • gives single-oscillator voices immediate width and movement
  • offers six-voice polyphony at under £1,000 in 1981
What does not
  • offer two oscillators per voice
  • include filter resonance sweep control beyond cutoff
  • support velocity or aftertouch sensitivity
  • allow real-time patch editing without entering edit mode
Use it if
  • players who value immediacy, tactile simplicity, and bucket-brigade chorus
  • producers needing accessible polyphonic pads and leads in 1981-style contexts
Skip it if
  • those requiring oscillator layering or detuning per voice
  • those needing stable tuning across long sessions
  • those requiring deep modulation routing
The written brief1 min read

What it is and what it was built for

A six-voice polyphonic analog synthesizer released in 1981. Built to be affordable: one oscillator per voice, no complex modulation matrix, no premium chassis. Designed for players who needed polyphony without the price or maintenance of rivals like the Prophet-5 or OB-X.

How it works, in terms a player would use

Each voice has one oscillator: sawtooth, variable pulse, or PWM. PWM is controlled by a dedicated LFO. There is no second oscillator per voice. The chorus, phaser, and ensemble effects use bucket-brigade analog delay lines. Intensity for each effect is adjustable. Patch storage uses 32 memory slots. Patches save via cassette port. An arpeggiator is built in.

What it does better than anything else

Its bucket-brigade chorus delivers a thick, organic shimmer unmatched by early digital effects—and it is always on the signal path. That chorus, plus phaser and ensemble, gives single-oscillator voices immediate width and movement no other sub-£1,000 polysynth offered in 1981.

What it does badly

It lacks oscillator layering or detuning per voice. Tuning drifts more than dual-oscillator contemporaries. No filter resonance sweep control beyond cutoff. No velocity or aftertouch sensitivity. No patch editing in real time without entering edit mode.

What people made with it

It made accessible the sound of layered analog pads, shimmering basslines, and chorus-saturated leads in early 1980s pop, synth-pop, and new wave—especially where budget ruled out higher-end polysynths.

Who should use it, and who should not

Players who value immediacy, tactile simplicity, and that specific bucket-brigade chorus over flexibility or stability. Not for producers needing precise, repeatable modulation or multi-oscillator textures.

Is it worth your time

Yes—if you want six-voice polyphony with lush, chorus-drenched analog pads and leads at a price that avoids the Prophet-5’s complexity and cost. No—if you need two oscillators per voice, deep modulation routing, or stable tuning across long sessions.

Same bench · Synths & drum machines4 of 40
9:20
ARP 2600ARPThe ARP 2600 is a foundational analog synthesizer designed for education. Its semimodular architecture, front-panel signal graphics, and duophonic voice count reflect its classroom purpose—not stage use. Its original filter was replaced after a patent dispute. It teaches synthesis more directly than any contemporaneous instrument, but offers no polyphony, no presets, and unstable tuning.
8:47
Roland CR-78RolandThe CR-78 is historically singular: the first microprocessor-based drum machine and the first to allow user-programmable pattern creation. Its analog synthesis yields 14 fixed drum sounds. Its four-note polyphony defines its rhythmic ceiling. It does not offer sound editing, velocity layers, or sample playback. It belongs in rooms where constraint is compositional strategy—not a flaw to be patched.
8:36
Yamaha CS-80Yamaha · 1976The Yamaha CS-80 is an analog synthesizer introduced in 1977. It supports true 8-voice polyphony, with two independent synthesizer layers per voice each with its own set of front panel controls. It has a layered keyboard that is both velocity-sensitive and pressure-sensitive, with polyphonic aftertouch and a ribbon controller for polyphonic pitch-bends and glissandos. Production of the instrument ceased in 1980.
9:20
Casio CZ synthesizersCasioThe Casio CZ series is a line of low-cost, digitally implemented phase distortion synthesizers introduced by Casio in 1984. They simulate analog filter behaviour without physical filters, using digital phase distortion instead. Each oscillator plays waveforms in series—not parallel—enabling sub-harmonics but restricting waveform pairing. Polyphony drops from eight to four voices when using two oscillators per voice. They were built for amateur musicians, prioritising affordability and portability over expressive control or sonic flexibility.
Up next in Audio

Fender Princeton Reverb

Fender · 9:44

Reverb and vibrato aren’t add-ons here—they’re wired into the soul of a 12-watt tube amp.

9:44