“KORG POLY 800 MK1 New Battery mod and the Moog Slayer/ FM Mod
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.
A new battery holder installed for easy swap. The C Cell battery compartment has been disabled so no more worries about acid leaks, as the new battery retains all the patches.
Moog Slayer mod gives you Frequency and resonance control that sound GREAT !
12/24 DB filter selector switch and a FM control. With these mods and the synth restored its now an even greater synth. Korg should have built it this way !
Comes with A/C adapter. original owners manual.” Click here to search for synths on eBay
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“Up for bid is my 1986 Korg Poly 800 II. I acquired this Synthesizer back in August, and after some use in my collection, I’ve decided to let it go. The keyboard itself is in good condition, but you can certainly tell it was a well loved synth. There is wear on the finish of the plastic, which reveals a shiny undercoating, however this does not affect the playing quality at all (see pictures for more details). It has a set of custom patches pre programmed through midi, so if you want the stock factory patches, I can certainly do that for you if you send me a message. It does come with a custom fitted gig case, but if you don’t need/want it just let me know! All of the keys are in perfect working order, and there are no mechanical flaws whatsoever. It also comes with the original power adapter. Thanks for looking, and happy bidding!” 
“Korg Polly mk2 with Moog slayer mod. Comes fully working. Generally the condition is good but, it is old and does have signs of use. There is also a faint postcode that has been written with what looks like a security marker pen, but is hardly noticeable.
“This is a used item. Not sure if it works or not” 
“This item is for parts! No returns!
“Spectacularly preserved Korg Poly 800 analog synth with hard case, original manual, original factory preset cassette tape and original power source. We recently purchased it from Switched-On in Austin TX and it has been fully serviced. It can be battery operated and has pegs so that it can be strapped on and played as a keytar (awesome). ” 
“Battery compartment door is missing. It powers up intermittently and display shows “Load” when it powers up.
“Does not power on. Body was opened to look inside. Maybe you can fix it? I don’t know how.”