” This is a vintage analog Korg Synth from the early to mid 80s. I bought it used in the early 90s. Works great and is loaded with the original factory patches. I recently spent about 10 hours of time with this unit transfering old song parts to the computer, consequently I know it’s working just fine. The original AC adapter stopped working and has been replaced with an Archer AC Adapter with the proper voltage and miliiamps. There is a security plate attached to the bottom of the unit that I used to secure the keyboard at a live gig. I’ve also etched out (removed) my name and ID number that I engraved on the bottom of the unit. Happy bidding.”
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“Does not turn on. Not with an ac adapter and not with batteries.
“Korg Poly 800 for sale. Comes with original manual and original power supply” 
“Korg Poly-800 poly800 Analog Synthesizer
“Keyboard owned since early nineties. The unit has always functioned well. It has hardly been used since then, as I never learned to play, even after buying the included manual. It also comes with a foot switch to change programs, AC adapter, new batteries for program back-up (never used) and midi cable.” 
“Up for sale is my Korg Poly 800 synthesizer with “Moogslayer and FM800″ Mods. I have had it for several years and don’t use it so much to shake the walls anymore so hoping it will find a home that it will get some use in. It works and sounds fine with all keys and MIDI functioning great and the memory battery was replaced and moved from the motherboard a couple of years ago for a longer, leak-free life. I am selling it AS IS WITH NO RETURNS since it is modified and has a couple of issues addressed below.” 
“Works great. I have had it in my studio for a few years. It has the normal signs of use that any old synth has.” 
“Please look carefully the photograph before your buy.
“Korg Poly800 with mods
“100% working and stored without use for many years meaning it’s in fantastic condition for its age,
“Great looking for it’s age and works, but I don’t think it’s working properly. I tested it with headphones and faintly hear the keyboard, but it also sounds the same on all keys. I haven’t opened it and since I’m not a expert and would prefer someone who knows what they are doing get inside. All knobs, keys and switches on intact and selling the PARTS ONLY/AS-IS. Power cord not included, but it works on DC 9V batteries” 
“Rare vintage Korg Poly 800 Keyboard in good condition.
“Beautiful Korg Poly 800 with only a few minor scratches on top, marker on bottom and missing a few screws on the bottom. I tested it with an aftermarket 9V power cord and it powers on and looks magical however it needs to be serviced. I could only get a few sounds out of it, most of the time I could not get anything. This is being sold for repair. Includes vintage Hybrid case in good condition with wear, missing corner guards”
“Comes with a Korg HSC. The adaptor is included but is for an international outlet. You will need to use a convertor or purchase a new adaptor. All keys and functions work properly. ” 
“great 80’s sounds” 
“Selling my korg poly 800 synthesizer.
“Fully functional keyboard. Works with batteries but not with the wall plug converter. Could be it just needs a new converter but I don’t have one to test it with. ” 
“The unit works great . One of the d# key is a little crooked so when pressed it tends to stay down till put back in regular position . You can find the keys for really cheap and is an easy fix.” 
“This is a Korg poly 800 in pristine condition. Comes with its adapter and very thing works. No noise no problems.” 
“For sale is a Korg Poly-800 in perfect working condition.
“Excellent working condition, all buttons and joystick work as they should. Some visible wear from use but always kept in temperature-controlled, smoke-free studio.” 
“polyphonic analogue synthesiser in good working condition.
“This item is being sold by Sound Core Music in Carbondale Illinois.
“A great vintage synth, in good condition, comes with a filter and resonance mod, also includes power lead. Thanks for viewing.” 
“Used Korg Poly 800 ii. New power adapter. Missing battery cap on back, but not needed if using adapter. All keys in working order, all functioning. Makes some cool sounds, just didn’t work with the music I wanted to make.” 
” Used Korg Poly 800 ii. Still works great and makes some really cool sounds” 
“Good sounding synth! Easy to take anywhere. No issues with it, and decent cosmetic condition. This one’s missing the battery cover like most of them. You’ll just have to restore the default sounds when you put batteries back in it. You just have to play a sequence of noises into it that you can find on the internet…”
” working korg keyboard synthesizer poly 800 also has the original manual, cassette tape,& box
“Korg poly 800 analogue synthesizer keyboard. Very good condition. Just a few slight marks. Comes with hard case and user manual.
“Vintage 1980s Korg Poly 800 Analog Synth Synthesizer Please Read Preset Issue
“Korg Poly800 with mods
“Up for grabs is a VINTAGE Korg Poly 800ii synthesizer
“The Korg Poly 800 for sale here has been completely cleaned and restored to perfect working condition. All keys contact and rubbers have been cleaned and working.
” Korg Poly-800-ll Polyphonic Vintage Analogue Synthesiser, well sort after priced to sell.”