Korg OASYS used once for a small recording project and has sat unused since. In new condition with manuals etc. This is an excellent buy. Here is more info from KORG.

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OPEN THE NEXT CHAPTER

Introducing the revolutionary OASYS Open Architecture Synthesis Studio, the newest chapter in Korg's legacy of expertise and innovation.

Vision, innovation and technology converge in one brilliant instrument that sits in a class all its own – the amazing Korg OASYS Open Architecture Synthesis Studio.

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New Operating System
Operating System Version 1.3 is here! In addition to new improvements and enhancements, version 1.3 also features a demo version of the latest OASYS Expansion Instrument EXi MOD-7 and KARMA 2.1! -
Electronic Musician Review of the OASYS
Check out Electronic Musician's review, Introducing the Mother of All Workstations to find out why "...you’ll probably spend months (if not years) discovering things that you never imagined it could do." Keyboard Magazine Review of the OASYS
Find out why Keyboard Magazine says "If you want to sound like you and no one else, I can think of no other instrument that makes it more possible than this one..." in their review of the OASYS A Position of Leadership
Korg has always taken a position of leadership – from our early days making analog synthesizers, through our pioneering of the workstation concept, into our state-of-the-art modeling/DSP synthesis and effects developments, our innovations in digital recording, and our implementation of the ground-breaking KARMA® technology. OASYS brings together over 40 years of refined expertise in making the finest and most intuitive and musical instruments in the world.

Korg designed OASYS to provide a full set of audio production tools to the demanding musician, and to reflect the changing nature of today’s music making process. OASYS brings together the world’s most powerful synthesizer, studio quality effects processing, second-generation KARMA technology, advanced MIDI sequencing, 16-track audio HD recording with CD burning, plus a flexible MIDI control surface all into one elegant instrument.

OASYS is not only an entirely new instrument, but a completely new platform to support Korg innovation for years to come. Powered by an ultra fast computer processor, and running newly-developed proprietary software atop Linux underpinnings, OASYS offers all the benefits of a variable software system, backed by the hardware integrity that can only come from a fully-integrated instrument design.

New synthesis methods for creating sound (EXi Expansion Instruments), new effects (EXf Expansion Effects), and additional PCM libraries (EXs Expansion Sample Libraries) can be added, ensuring that OASYS will remain the centerpiece of your musical world well into the future.

For new technology to be beneficial, it must remain accessible. Highlighted by a 10.4” color TouchView display, the front panel features a vast array of assignable control elements – pads, sliders, joysticks, knobs, ribbon, etc… all designed to provide effortless fingertip control. And while OASYS is a world unto itself, it can still play nice with others. The back panel offers a wealth of analog and digital inputs and outputs, including USB 2.0.