This auction is for a Yamaha CS1X synthesizer in excellent condition.  It comes with power supply, original manual, data list manual, and "Blue Book" aftermarket advanced user guide ( a great resource tool).  This is a very flexible and powerful sound creation keyboard.  The preset sound banks are excellent also.............................................From Vintage Synth Website:
Specifications:
 
Polyphony - 32 notes Voices - XG Format - 480 Normal Voices and 11 Drum Kits #Instruments - 16 Part multi-timbral Filter - YES (w/ real-time control) Arpeggiator - Yes, including Hold and Split Keyboard - 61 keys (velocity sensitive) Memory - Preset: 128; Programmable; 128 Control - MIDI & computer interface,
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The CS1x is Yamaha's  Analog Emulation performance keyboard . It's a digital synthesizer that emulates analog style, sounds and controls. All controls and parameters are real-time and MIDI controllable. As well as a superb set of quality synth bass, pads, voices, leads and arpeggiated sequences there are plenty of amazing drum sounds also with analog sound and control.

Some of the coolest features of the CS1x  will provide you with instant sonic gratification and hands-on real-time tweakability. There are 6 knobs for envelope attack, release, filter cutoff, resonance and 2 are assignable knobs. Two scene memories will remember the current state of the envelope and filters as set by the control knobs so they can instantly be recalled and you can even use the Mod-wheel to morph from one scene into the other, very cool! Scene Memory data is also stored with your synth patches. Built-in digital effects are great but the Arpeggiator steals the show with 30 inspirational patterns suited for techno, house, hiphop, basslines and basic arpeg. patterns.

Plenty of memory (128 preset, 128 user) and MIDI control make the CS1x perfect for both live and studio use. Control the synth, arpeggiator and editing through MIDI control. The CS1x only has limited multitimbrality in which, when hooked up to a sequencer, MIDI channels 5-16 offer plain old Yamaha XG synth sounds but MIDI channel 1 holds the CS1x's main sounds and effects. It's been used by Underworld, Bushflange, Jamiraquai, Skylab2000, Somatic Responses, and David Bowie.

In short, the CS1x takes the best of analog - simplicity of use, natural interactivity, thick sound, and knobs - and combines it with the best of digital-reliable pitch, plenty of memory, one-touch setting reconfigurations, hundreds of voices, MIDI, etc. The result is a powerful interactive experience in which users can simply turn knobs to control the sound in real time without steep learning curves, complex operations, or pages and subpages of hidden menus. And being that it's digital, data can be easily saved for future use.


From Yamaha:

"The CS1x has a very high initial fun factor," said Avery Burdette, product manager at Yamaha. "For example, when you turn it on, the first sound is a drum kit with the arpeggiator already programmed, so that you simply press keys on the keyboard, and it immediately responds by playing an extremely funky and addictive rhythm. This is just one of 256 performance experiences that makes the CS1x so engaging.  An important feature on the CS1x is a "Scene Controller," which allows instant and dramatic shifts to be created in the atmosphere and timbre of the sound. "This instrument permits a kind of sound motion, movement and morphing that has never been available before," notes Burdette. "It can create an infinite variety of permutations of its exceptionally mellow and rich sounds. Not to mention the fact that you can simply reach up and grab a sound control knob and turn the sound into something else immediately. The musical possibilities are immense."

Other notable features of the 61-key, 32-note polyphonic Yamaha CS1x include 480 normal voices and 11 drum kits for Yamaha XG format music production and playback; 128 preset Performance programs, as well as 128 user Performance program memories; 30 versatile arpeggiator six real-time control knobs (including two assignable knobs) which provide intuitive voice editing control over up to 4 voices; versatile arpeggiator functions, and a TO HOST serial computer interface. There is even a Line Input for adding accompaniment or sampled sound; for example, from the Yamaha SU10 Sampling Unit or QY22 Music Sequencer, which can be conveniently placed on the built-in shelf atop the CS1x.