You are looking at a vintage Yamaha CS01 analogue monosynth - an awesome, fat little fella of a synth and lovely to program. Comes complete with original carrying case and strap - wow :-)
Vintagesynth.com say this about it:
The CS-01 is a very old but classic analog monosynth from Yamaha... the CS-01 has been
recognized by today's electronic musicians as one fat little
bass machine with simple controls. In a nutshell, the CS-01 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 CS-01 is the perfect monosynth for bubbly and growling
bass! It features a very nice 12dB resonant VCF 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.
This keyboard is unique as it has had Resonance and Cut-Off Frequency fine-tune knobs added by an analogue synth specialist, prior to us buying it in about '95. Happy bidding!
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