Korg, Moog Slayer, Poly 800 @ 14 January 2017, Comments Off

800mods “I have a Korg Poly 800 factory restored and refurbished (by Chris at thisoldsynth.com) with a new internal battery and two mods added. Description of mods from Wikipedia:

There is a modification that adds two knobs to the VCF, increasing the filter’s range and expressiveness, known as the Moog-Slayer filter modification; the FM-800 filter modification which adds a pseudo FM control to the filter; a modification for external audio input; and some users have added a switch to control the filter slope, adjusting it from a 4 pole (24db/oct) to a 2 pole (12db/oct).

As you may have already read, the Poly 800 is a paraphonic analogue synth (all but the DCO’s, which, if anything, ensure that the oscillators stay stable).
Without the mods the keyboard is fine, but with these additions, the instrument can attain a decent range of expression.
A great synth, with multiple applications, the Poly 800 is one of the cheaper ways to get your hands on that analogue sound. ” Link

Korg, Moog Slayer, Poly 800 @ 01 October 2016, Comments Off

used-korg-_poly_800 “Works great…

Has the mood slayer filter mod…

Takes batteries and I have an adapter for it as well.

Comes with original soft case.” Link

EX 800, Korg, Moog Slayer @ 27 February 2016, Comments Off

korg ex800 “This has been safely racked up in my studio for the last 5 years but it’s ~30 years old and the cosmetic condition reflects this.

Good points:
Rack ears included, these seem to be quite rare.
Memory battery replaced – if it dies in 30 years time you won’t have to do any soldering, just snap another battery into the holder!
Moog Slayer filter mod – real time hands-on control of the filter cutoff.
FM-800 filter mod – when turned up gets some FM-like sounds and makes the whole synth a lot dirtier and more exciting.

Bad points:
One button missing (doesn’t affect operation).
‘Resonance’ control of Moog Slayer mod doesn’t appear to do anything (middle extra pot).” Link

Korg, Moog Slayer, Poly 800 @ 16 January 2016, Comments Off

p800 “Up for auction is a Korg Poly 800 Model PS-800 synthesizer with the moog slayer and FM mods. S/N is 024618. I bought this on ebay earlier this year with non-functioning DCOs. I replaced one logic chip and the internal battery and got it up and running again. I also found a little knob to use on top of the joystick as the original was missing. It is missing one rubber foot on the bottom and does not come with a power supply. I really love this unit and would like to keep it. However, the home studio is getting a little crowded and I’d like this to go to a home where it will get some use. My home studio is non-smoking and the unit looks good. Unit is tested as best I could. I could not get the tape/patch interface to work, so assume that doesn’t work. Also, I loaded up a couple presets by hand, but since the process is fairly laborious, I left it to be finished by the next owner. So when you turn it on, you’ll get a lot of empty presets until you program a sound in there. Due to the age of the unit, it is being sold as-is. If you own other vintage gear, you’ll understand why. This thing is from the mid 1980s. The dark brown case with teal trim will testify to that!

Now let’s be perfectly honest, there is NO WAY this thing sounds like, or is better than, a Moog. It’s not a bad filter, but it’s not a transistor ladder filter. It’s just a fine average analog low pass filter. How the slayer mod works is you have to program the Poly 800 filter’s freq and Q to maximum values. The CVs then are attenuated back by the added pots, so you’re essentially tweaking the freq and Q back to normal levels, then opening up the filter or increasing the Q back up to the preset value. Still, it works better than messing with the programming menu. The FM mod adds DCO modulation to the filter to dirty up the sound. I really didn’t use that much but it was an easy mod to add. Rest assured, all this repair and mod work were done by someone who has spent the last 38 years of his life designing, modding and repairing electronic music equipment, so it’s done right!” Link

Korg, Moog Slayer, Poly 800 @ 28 November 2015, Comments Off

p800” Up for your consideration is a fully functional Korg Poly 800 synthesizer with several modifications that enhance the functionality and make this unit a fine candidate for the central piece to your music production environment. Modifications were professionally installed by experienced and skilled hands and are described below. I’ve modified a good handful of these and this particular machine is in the best cosmetic condition I have ever seen. Absolutely like-new!! Original Korg power supply included.” Link

Korg, Moog Slayer, Poly 800II @ 19 September 2015, Comments Off

p800ii “Korg Poly-800 49 Key Synthesizer in Need of Repair condition. No audio output, powers on but no sound. Includes power supply.” Link

Korg, Moog Slayer, Poly 800 @ 04 July 2015, Comments Off

korg poly 800 “Korg Poly 800 Analog synth.
Generally good and clean, all works with the exception of the sequencer which I can’t get to work. Seems like it will record the notes but not play them back.
The usual scratches and wear, and a small piece of plastic missing from one key underneath.

I’ve fitted a coin cell inside to retain the patch memory so you don’t need the D cells in the back.
I’ve also carried out the Moog slayer and FM mods as described here: http://synthmod.net/korg/moog_slayer/
All mods have been carried out to a good standard … I have a lot of experience soldering :)

The synth sounds great, especially when you hook it up to an external sequencer and start playing the freq and resonance controls of the mod. ” Link

EX 800, Korg, Moog Slayer @ 16 May 2015, Comments Off

korgex800 “Hi

Biete meinen einwandfrei laufenden ex800 an.

Ich habe ihn gemoddet und die Tasten wurden gereinigt.

Folgende Mods wurden verbaut:

-Moogslayer mod (cutoff und Resonanz)

-filterslope umschaltbar (12/24db)


-Volume-Poti für DCO1 und 2 und Noise

-Chorusspeed und level

-Tune mod mit fein und grob Einstellung

-jeweils schalter für die Wellenform und die oktavelagen lassen sich einzeln dazumischen mit den kleinen potis” Link

Korg, Moog Slayer, Poly 800 @ 25 April 2015, Comments Off

korg poly 800 with moog slayer mod“You are bidding on and excellent condition Korg Poly-800.

All features have been tested and work perfect. The unit is very clean, and has been treated with the popular Moogslayer filter mod with complete success, as well as a Memory upgrade that allows you to save your patches! It’s also got Blue LEDs!” Link

Korg, Moog Slayer, Poly 800, Poly 800II @ 07 March 2015, Comments Off

p800iimoogslayer” Vintage korg poly 800 analog synthesizer with moog slayer mod. Keyboard is in used condition shows wear and has a few cigarette burns on keys volume pot is a bit scratchy when turned, number keys double trigger, battery compartment has some light corrosion and has not been tested with batteries works fine wih power cord(not included). All keys and functions are working and has factory patches loaded. Two added knobs allow adjustment of cutoff and resonance. Being sold as is since it has been modded.” Link

EX 800, Korg, Moog Slayer @ 28 February 2015, Comments Off

ex800 “This is an awesome instrument, capable of some really great nostalgic sounds. This particular unit was modded with the “Moog Slayer” filter mod, adding a low-pass filter and resonance control at your fingertips. This mod was done by someone else, not me, but it was done well.

It has a lot of cosmetic wear and tear – came to me that way when I bought it on ebay a couple years ago. Missing one button cap, but the button still works. Fully functional and sounds great.

Reason for selling is I have too much gear and it’s a shame to have stuff and not use it. Someone needs to buy this synth and give it all the love it deserves.” Link

Korg, Moog Slayer, Poly 800 @ 13 September 2014, Comments Off

p800” Got this in trade with the mods already done works xlnt with all keys sliders knobs functioning fine comes with semi hard case with good zippers a data tape and power adapter only selling cause im needing a korg trinity or a triton keyboard ” Link

EX 800, Korg, Moog Slayer @ 31 May 2014, Comments Off

Korg EX800 with circuitbenders mods professionally installed (http://www.circuitbenders.co.uk/synthmod/POLYEX.html). Four original Korg knobs have been added to aesthetically match the original. Added functions include :

- Filter cutoff and resonance

- FM selection and amount

- 12dB / 24dB filter response switch

With these mods the EX800 can reach new sound territories, with analog filter control and distorted/FM sounds.

Looks almost brand new and comes with original box and original rack ears.” Link

Korg, Moog Slayer, Poly 800 @ 24 May 2014, Comments Off

“Korg Poly 800 Analogsynthesizer

Verkaufe hier einen Korg Poly 800 mit Modifikationen:

White Noise

inklusive Original Netzteil und ausgedruckter Bedienungsanleitung” Link

Korg, Moog Slayer, Poly 800 @ 12 April 2014, Comments Off

“Poly 800 mit Filtermod.
Schalter 6/12db

Leider keine Funktion mehr. Netzteil oder spannungsversorgung?
Bender außerdem lädiert.
Keinerlei Rücknahme, Gewährleistung, Garantie ” Link

Korg, Moog Slayer, Poly 800 @ 12 April 2014, Comments Off

“Ich Verkaufe hier meinen “KORG POLY-800″ mit Filtermodifikation!

Der Poly-800 wurde 1984 vorgestellt!
Ein 8-stimmigen Analog-Synthesizer mit 64 RAM-Speicherplätzen,
ein eingebauten Step-Sequencer und
mit der damals brandneuen MIDI-Schnittstelle.
Darüber läßt sich das Instrument auch als Remote-Keyboard umhängen. Super Cool!!!!

Gerät funktioniert einwandfrei! Leider verliert das Teil seine Speicherplätze ohne Batterie! Da das Gerät ohne Batterien verschickt wird, müssen die Speicherplätze erst neu von Kassette geladen werden! Richtig gelesen! Aber es geht auch einfacher… ihr bekommt die Kassette als WAV-Datei.

Der Zustand ist dem Alter entsprechend sehr gut, keine großen Kratzer, keine ausgeschlagenen Ecken, ganz wenig Schmutz!
Nachträglich wurde eine Filtermodifikation eingebaut, um mittels zweier zusätzlich Potis Cutoff & Resonance bedienen zu können!” Link

Korg, Moog Slayer, Poly 800, Poly 800II @ 08 March 2014, Comments Off

“Up for sale is my poly-800 mkII. It has the moog slayer mod, FM mod, 12/24 db/oct switch, new battery and battery holder installed.( Note: the filter mod allows a greater range in the filter and can cause ear/speaker damage if the resonance is turned up too high. I usually set the resonance digitally at “12″ and then control resonance from the knob within that range). The poly-800 mkII has a digital modulated delay and an onboard EQ. The polyphonic sequencer is expanded from the original. The synth comes with the correct power adapter and a 14 day money back guarantee.” Link

Korg, Moog Slayer, Poly 800 @ 08 March 2014, Comments Off

“Up for sale is my poly-800 MKI. It has the moog slayer mod, the 12/24 filter switch mod and the battery mod. It is fully functional and sounds great. It’s an 8 voice paraphonic analog synth with chorus, polyphonic step sequencer, hold mode, chord mode, and poly mode. I like it for low-fi sounds. The moog slayer mod allows for increased resonance which can damage ears and speakers if turned up too high. I normally set the digital upper limit for resonance at 12(out of 15) and then use the knob to sweep that range. The synth is in decent cosmetic condition.” Link

Korg, Moog Slayer, Poly 800 @ 11 January 2014, Comments Off

“Korg Poly-800 Vintage Keyboard Synthesiser w/ Moogslayer and FM-800 mods

8 voice poly – 2 DCO’s per voice.

24db/oct Low pass filter

Sequencer, midi In/Out/Thru, 64 patch memory

49 key keyboard.

This unit has been serviced and is fully functioning. It has a new battery installed so that memory will be retained for years to come. Cosmetically the unit is very clean, no noticeable scratches or damage.

Additionally, this Poly-800 has had the Moogslayer and FM-800 mods professionally added. These are controllable by 3 added knobs – Filter cutoff, Resonance, and FM – where the filter is modulated by the Pitch of the DCO. These hugely extends the functionality and play-ability of this synth. It actually turns it into quite a powerful machine with these mods added, capable of producing very wild levels with the filter in full oscillation and the FM mod active. Very fun to play around with!!” Link

EX 800, Korg, Moog Slayer @ 28 December 2013, Comments Off

“Missing 2 button pads as seen in photos, but button components look unharmed. Missing Cutoff, Resonance, and Speed knobs. Some scratching on parameters, but print can be made out. Tested and powers on. Comes with power supply.” Link

EX 800, Korg, Moog Slayer @ 19 October 2013, Comments Off

” Up for sale is a fully working Korg EX-800 that I have modded. Here are the mods:

-Fresh lithium battery and socket install for voice memory (you won’t have to change it for another 20 years!)
-Moog Slayer Cutoff/Resonance mods – (allows you to control the cutoff and resonance manually, just set max resonance to 11 in presets)
-FM Modulation mod
-12/24db filter switch
-Audio input (you can run audio through the filter and also use the onboard chorus)
-Blue LED numbers
-Internal power supply rebuild (replaced all regulators– power stable)

There’s a reason they call the mod the Moog Slayer! This is the seventh Korg I have modified in this way, and I can guarantee you will be satisfied with the results! Guaranteed not DOA. Grab this while you can, you will surely turn heads!

Sorry, there is no power adapter available with this keyboard, but it will accept any 9V Boss-style center negative supply. Thanks for looking!” Link

Korg, Moog Slayer, Poly 800 @ 12 October 2013, Comments Off

“This unit features the rare and desirable reverse colour keys – this is a factory option, not a third-party paint-job. It’s in good condition for its age, with a few marks and scratches, but nothing major. It has also been modified with a well-known mod which eBay will not allow me to name, which adds two manual control knobs for filter frequency and resonance; and a memory backup battery, so it should retain patches and sequences when the main batteries are removed. The original Korg power supply and a photocopy of the manual are included.” Link

Korg, Moog Slayer, Poly 800 @ 14 September 2013, Comments Off

“Very clean for age, a few light blemish mark’s to the upper case & a few scratches on the underside from being on a stand. It’s had a new battery & holder fitted, had the key contact’s cleaned, new felt strip on key’s so very soft & quiet when played not clunky like the one’s you hear on YouTube. Comes with soft case manual & tape with the factory presets & loads of banks of patches all on the tape & 9 volt psu. It’s got the Moog-Slayer Cut-Off & Resonance Mod fitted don’t set the resonance higher than 12 or risk blowing your speakers!! Very loud. Can get some great sounds out of it. Happy bidding. ” Link

Korg, Moog Slayer, Poly 800, Poly 800II @ 14 September 2013, Comments Off

“Up for sale is a fully working Korg Poly-800II that I have modded. Here are the mods:

-Fresh lithium battery and socket install for voice memory (you won’t have to change it for another 20 years!)
-Moog Slayer Cutoff/Resonance mods – (allows you to control the cutoff and resonance manually, just set max resonance to 11 in presets)
-FM Modulation mod (white knob)
-12/24db filter switch
-Audio input (you can run audio through the filter and also use the onboard delay)
-Blue LED numbers
-Internal power supply rebuild (replaced all regulators– power stable)

There’s a reason they call the mod the Moog Slayer! This is the sixth Poly I have modified in this way, and I can guarantee you will be satisfied with the results! Guaranteed not DOA. Grab this while you can, you will surely turn heads!” Link

EX 800, Korg, Moog Slayer @ 20 July 2013, Comments Off

“Up for sale is my modified Korg EX-800 module. It is fully functional and has been modified as follows: the filter cutoff and resonance ca be altered via new potentiometers, the fm mod has been added allowing osc1 to modulate the vcf, a toggle switch has been added to pick 12db/oct or 24db/oct filter output. (originally these units were 24db/oct only), the polysix type knobs for vol,tuning and sequencer speed were replaced to make it uniform in appearance. * It’s important to note that the filter resonance is now capable of reaching ear/speaker damaging levels – I recommend setting the resonance to 12 or 13 (out of 15) as the upper limit of the resonance before sweeping with the knob. ” Link

Korg, Moog Slayer, Poly 800 @ 13 July 2013, Comments Off

” A unique modded vintage Poly-800, contains the Moog Slayer Mod/Frequency Modulation Mod/Resonance Frequency Mod. No other keyboard like this in the world. The sounds you can get from these mod are INSANE! Each mod has a knob built into the circuit board to control the mod appropriately.

100% working, all keys function, no damage. Only had it for a year. A great beginner synth and keyboard! This was my first synthesizer and I fell in love with it. Sadly there is no more room for this in my collection. I am giving away a deep part of me! ” Link

Korg, Moog Slayer, Poly 800, Poly 800II @ 06 April 2013, Comments Off

“As rare as Korg Poly 800′s are with the Moog Slayer Mod installed, more rarer is to find one in the MK2 version!.

The Modification adds knobs for Filter Freq Cut Off, and Filter Resonance. Knobs were professionally installed square and straight to the panel, *note: one knob is missing colored cap, easy to replace.

Other than some slight marks or scratches, this keyboard looks and performs excellent!!

Other synth specs: 8 DCO, VCF, 8 Voice, 64 program, 49 note, Midi with 256 event step sequencer, Mark !! replaces the regular poly 800′s chorus section with a comprehensive digital delay section which is much more useful!

All keys work with nice responsive spring action! Knobs turn smooth w nice tight feel. Joystick works correctly in all directions. All buttons faders functions work as they should. Nice custom made patches.

***Added note, Inspected that the battery compartment is clean and has no corrosion. ” Link

Korg, Moog Slayer, Poly 800 @ 12 January 2013, Comments Off

“I’m selling my Korg Poly-800 MKI. It is fully functional and clean inside and out. It has been modified as follows: the filter cutoff and resonance can be controlled with 50K pots, there is a 2 position filter switch for 12db/oct or 24db/oct, It has the fm mod and an internal battery/battery holder has been added. (Note: The filter modification allows for a greater range in the resonance which can damage speakers or eardrums if turned up too high) It comes with a power supply, the original factory soundbank audio file, my soundbank presets audio file and a 14 day money back guarantee.” Link

Korg, Moog Slayer, Poly 800 @ 05 January 2013, Comments Off

Vintage Synth (1983/84)
Fully Modded
Mods Include;
Moog Slayer (adds Filter Cutoff & Resonance control knobs)
12 / 24 db Filter Select mod (select between a 12 or 24 db filter)
FM Mod (adds the ability to control Filter Cutoff with DCO1)
Battery Mod (installed a battery holder and new battery to store patches when powered off)

This Poly 800 shows signs of its age but has been fully tested and works perfectly. There is what appears to be a burn mark on one of the keys that does not affect the key’s action in any way, purely cosmetic. I am including a brand new power adapter that I bought specifically for the poly 800 (9v 1 Amp Center Negative). Again, all keys, buttons, inputs & outputs including audio, midi and tape have been tested. ” Link

Korg, Moog Slayer, Poly 800 @ 24 November 2012, Comments Off

“Great korg poly800 that I modded a while back. The moogslayer mod turns the filter into a beast perfect for dubstep. The fm800 mod adds a nice bit of weirdness to the sound. Everything works great. It has some scuffs and small scratches but nothing major. I’ve never tried using it with batteries but it includes the adapter (I never felt the need to buy all those big batteries for what was a studio kept keyboard.) ” Link

Korg, Moog Slayer, Poly 800 @ 27 October 2012, Comments Off

“Vintage synth with digitally-controlled oscillators (DCO) and analog filters and amps. Nice built-in stereo chorus and sequencer. I added some of my favorite filter mods to this one. Design of these mods are courtesy of Atom Smasher.

Moogslayer – This adds Cutoff and Resonance knobs to the front panel.

FM-800 – This isn’t typical FM with one audio oscillator modulating another. It is the audio oscillator modulating the cutoff frequency of the filter.

12/24dB Switch – The factory 24dB/octave filter is great for many applications, but sometimes you just don’t want that abrupt loss of highs above the cutoff point, so now you have a choice.” Link

Korg, Moog Slayer, Poly 800 @ 01 September 2012, Comments Off

“This Korg Poly 800 analog synth.

Used but sounds great!

It has considerable scuffs and nicks on the front corners, and wear on the volume on/off knob. Someone has replaced (not I) the joystick top with duct tape. Minor cosmetic issues aside, it functions exactly as it should. A power supply is included, but fresh batteries should also be maintained.

The modification done is the famous “Moog Slayer Mod” that adds a dedicated pot to both the cutoff and resonance of the filter, and also bypasses the digital cap that was placed on the VCF internally. It’s completely free to be manipulated outside of the control from the programmer, and sounds fantastic. The resonance is a standard black knob, but the cutoff is a skull. It’s silly, I know. I’m starting this auction at an extremely low price with no reserve. Fully functional. Sold as is.” Link

Korg, Moog Slayer, Poly 800 @ 09 June 2012, Comments Off

“Great analog/digital hybrid with Moog Slayer Modification (adds real-time resonance, cut-off control and knob that is similar to frequency modulation) This modification can damage ears and equipment-so be careful! It makes this synth fun to tweak on the fly-without this mod the Poly 800 is limited, even if the sounds are cool.

Everything works great-all keys are fine, surface around certain knobs and sliders show wear-as any vintage 80′s synth does.” Link

Korg, Moog Slayer, Poly 800 @ 09 June 2012, Comments Off

“Korg Poly 800 Synthesiser with Moog Slayer Filter Modification
previously owned by David Murdoch of 80′s Electropop band

For sale one Korg Poly 800 synth that has been modified with the Moog Slayer Filter Mod that basically by-passes the fixed Resonator and Cut Off filters on the board. This modification allows you to change the filter setting by turning the analogue pots mounted on the front and not by the step buttons of the digital control. The sub frequencies this allows are truly AWESOME and can seriously damage speakers if not used in moderation.

This synth has previously been owned by David Murdoch of 80′s Scottish synth pop group Endagames and still has his signature on the side. I believe he used it on some of their later tracks although I can’t verify this.

The synth comes with the original wall wart.

The down sides are that it does not retain memory after being switched off, although I’m sure this is just a battery issue (it’s soldered to the board). It does accept the original presets via the tape in set up on the back, so if you switch it on and boot it up properly the original sweeping pads and sub basses are all there. The step sequencer does work although the speed slide doesn’t. I never had a problem with this because it was always midied to the PC sequencer.

I will supply you with a copy of the tape in presets wav on CD to boot it up and the original fixed filter pots that I removed for the Moog Slayer modification in case you ever want to put them back on. (???)

An analogue beast with a semi digital interface. Get it while it’s hot. Happy Bidding.”

Korg, Moog Slayer, Poly 800 @ 19 May 2012, Comments Off

“Korg Poly 800 with Mods!!!! Comes with power supply. This is a great sounding board with some of the most classic sounds.” Link