Yamaha CS01

Yamaha CS01 Image

The CS01 is a very old but classic analog monosynth from Yamaha. Although originally designed for use by novice musicians or first time synth-buyers, the CS01 has been recognized by today's electronic musicians as one fat little bass machine with simple controls. In a nutshell, the CS01 is simple to use and edit but still has some great features for any situation. It's tiny and portable, it has baby-sized keys and it can run on batteries, and there is a built-in amplifier and speaker which is quite fun.

As for sounds and synthesizing, the CS01 is the perfect monosynth for bubbly and growling bass! It features a very nice 12dB resonant voltage-controlled filter. In addition to the oscillators' sine and square type waveforms there is PWM and noise. There are also LFO controls, glissando (like portamento), a typical ADSR envelope generator, pitch & mod wheels and even a breath controller input. A CS01 mkII (pictured below) was later released by Yamaha soon after the original. It featured an improved 24dB resonant VCF (filter) with adjustable slider control over resonance instead of switchable on/off resonance as found on the original. The CS01 mkII is also identifiable by its black case with green letters.

Yamaha CS01 II Image

Yamaha CS01 II

The CS01 may look simple or toy-like but it is still able to create cool little analog bass blips, bass lines and bass bubbles that are just perfect for today's electronic musicians. It has been used by the Dust Brothers, Underworld, OMD, Richard Barbieri and Chick Corea.

Lookup Yamaha CS01 Prices

The link above will take you to an eBay search for this synth to see active listings with more images, specs and information. If you don't find it there, try looking in our forum marketplace. Our marketplace gets thousands of visits every week so make sure to check back often if you want to buy or sell a synth.

Related forum topics


Are you looking to buy or sell a Yamaha CS01? Post an ad in Gear For Sale or a request in Gear Wanted. For spare parts and repair services check out Gear Services & Other Goods. Our forums also has a Buyer’s Guide section where you can ask for advice on buying synthesizers.

48 Visitor comments
October 9, 2009 @ 10:00 pm
to answer
plikestechno question ,it's a digitally controlled analouge synth so it's an odd mix of the two !
September 22, 2009 @ 7:31 pm
great little bass synth but its no cs 5 and thats for sure.
de raaf
September 6, 2009 @ 8:05 pm
despite being very limited i love my cso1, the sound is great (especially pwm) powerful for being so little, but the major greatness comes from the sliders, you can change parameters very quickly, up to 3 with one hand if you want to, its great for improvising, and adding feeling to the whole thing. pitty that the lfo is so limited. sometimes dream that yamaha had made a bigger brother of the cso1 (2 or 3 ocs, more lfo, filter...) but still having mostly sliders. would be a player synth i think.
September 4, 2009 @ 10:46 am
I think it has an arrangement like the JX3P, where a high frequency master oscillator is divided down digitally by the keyboard decoder and then put thru an analogue waveshaper to give the final audio. The only thing that justifies the VCO tag is that the high frequency osc is modulated directly by the LFO... Sounds very good regardless!
August 25, 2009 @ 12:36 am
The only thing I don't get is that if it's digital then how do you have adjustable PWM?
Post Comment!
VSE Rating


User Rating

Rated 3.72 (459 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 - Monophonic
  • Oscillators - 1 VCO - triangle / saw / square / pulse / PWM
  • LFO - Sine waveform
  • Filter - 12dB Cutoff / Hi or Lo resonance with ADSR (24dB on mkII)
  • VCA - 1 ADSR envelope gen
  • Keyboard - 32 mini keys
  • Memory - None
  • Control - Breath Controller; CV/Gate via kit from Kenton
  • Date Produced - 1982, (1984 mkII)
  • Resources & Credits
  • Images from

Errors or Corrections? Send them here.