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via the seller: "This is fully functioning and has had a recent service to clean all controls, so there are no noisy or crackly pots when moving the knobs. The keyboard is flawless and every note plays properly. The CV/Gate sockets at the rear of the synth have been tested and everything works without any issues.
The CV/Gate sockets and functionality were tested using my Novation BassStation Rack synth's built-in MIDI CV converter. I could play the CS-10 on its own MIDI channel within Cubase on my PC and I could also play the BassStation on the CS-10 keyboard.
The audio input socket on the rear of the CS-10 also works without any issues, and I was able to put my Korg ER1 drum machine through the CS-10's synthesis path. Cool!
This is completely original other than the 2 sliders that control Portamento and Pitch Bend on the front panel. These were replaced a while ago with some very good alternatives. I have included an image that shows what an original slider cap (off my mate's CS-5) looks like in comparison to the replacements. While not identical I'm sure you'll agree they are more than satisfactory alternatives.
Included in the sale are a printed and bound manual that I downloaded from the Yamaha web site, and a booklet of synthesizer patch charts for the CS-10, CS-30 and CS-30L. I think I also have a copy of the CS-10 service guide too.
This is a great little, true analogue mono synth that has the flexibility of low, band and hi pass filters. It is only a single oscillator synth, but has mixable saw and square waves with noise and pulse width modulation too. This is the same as the CS-5 synth but has separate envelope controls for the filter and the amp, unlike the CS-5's shared envelope control for both."
"ACCOMPANIMENT SECTION WITH BASS AND SYNTH BASS IS MARVELOUS - YOU CAN PLAY WITH IT ANY MUSIC... 
"Moog Opus-3 Vintage analog Synthesizer Opus III string synth with ladder filter
"Korg 800DV monophonic / duophonic synthesizer. It's sounding awesome! Has two vco's, two ring modulators, sub osc's, great filters, portamento, lfo, pink and white noise, chorus and so on. Notice that some switches and faders are slightly crackling when you turn or move them. Optical it's in nice condition. It has new 'wooden' sides with nice veneer on it. There are some minor scratches and wear and tear on it, one original small knob doesn't fit right on the switch, but the overall condition is great for its age."
via the seller: "This is fully functioning and has had a recent service to clean all controls, so there are no noisy or crackly pots when moving the knobs. The keyboard is flawless and every note plays properly. The CV/Gate sockets at the rear of the synth have been tested and everything works without any issues.
The CV/Gate sockets and functionality were tested using my Novation BassStation Rack synth's built-in MIDI CV converter. I could play the CS-10 on its own MIDI channel within Cubase on my PC and I could also play the BassStation on the CS-10 keyboard.
