Custom White KORG Poly 800 with Moog Slayer Mod

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Poly800 Moog Slayer Mod - Sub Bass Demo by DRIL
Poly800 ultra hi frequency Moog Slayer Mod by DRIL

Korg Poly-800 Synthesizer with many mods

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"The first mods that were performed were the famous "Moog slayer" mod, which brings the cutoff and resonance pots out for manual use, with a knob added for each. NO MORE MENU DIVING! The filter mod was also done, so you also have a switchable 24/12db filter. I then began to experiment and added a FM amount knob, a chorus modulation knob, a noise control, and also a chorus distortion knob. Audio in was my last project, as was servicing the joystick and getting that working up to par... BE WARNED! The Moog Slayer mod CAN kill your speakers if the resonance patch data exceeds a value of 10-11. This is documented in the mod's DIY site..."

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Korg Poly-800 with Moog Slayer Mod & Original Box

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"For full details check out [this link] which gives technical information and some idea of just what the modification entails."

Two older videos linked in the auction below.




korg Poly 800 Synth with Moog Slayer Mod
YouTube Uploaded by AlexisG73 on May 13, 2007

Korg POly 800 mod

Uploaded by abertronic on Feb 4, 2009 -

abertronix on eBay (RSS)
Note the Poly-800 in this video also has the FM mod which is not installed in the auction above.

Korg Poly-800 played through Moog Sub Phatty

Published on Nov 19, 2013 msix Anthony·1 video

"A quick little video to demonstrate some of the sonic possibilities of substituting Korg Poly-800's filter with a Sub Phatty. Not a well prepared or imaginative one, just to give you the taste of this idea.

Poly-800 is sending MIDI to Sub Phatty to trigger it's gate and envelope and retrigger the LFO. Thus Sub Phatty becomes a natural extension to Poly-800 and provides it's multi-pole filter and multidrive circuit for polyphonic use.

Intro/outro music: https://soundcloud.com/messier6/ep-funk"

via Anthony Alfimov on The MATRIXSYNTH Lounge

On a side note, there are some notes there on the Poly-800 via Josh Nursing: "The Poly-800 filter is only limited by the lack of circuitry and control knobs in the Poly-800. It's actually a very powerful and fantastic-sounding filter once you mod the Poly-800, with 12/24dB/oct switchable mode, realtime cutoff and resonance. The actual limitations aren't in its filter but in its oscillator section..." You can find info on the Moog Slayer Mod here. They do come up pretty often on the site as you can see here. Below is a video I missed. Be sure to also see the FrankenKorg 800 Demo here.

Korg Poly-800 Moog Slayer Mod + Switchable Filter
Uploaded on Jul 20, 2011 yashnu·83 videos
Super high resonance right after :30. Watch your speaker levels.

"Synth DIY. Real-time Cutoff and Resonance, with switchable filter mode"

Korg Poly 800 Moog Slayer Mod Doth Not a Moog Maketh

via Ununseptium warehouse where you'll find the full post.

"For anyone unfamiliar with this manoeuvre, it involves tapping into a couple of variable resistors on the Poly 800's motherboard and routing them to a pair of potentiometers, which should be fitted onto the synth's outer casing, to control the filter cutoff and resonance. Here's a link to the destructions." Note that is a link to the Moog Slayer Mod instructions and not Ununseptium warehouse's post.

P800 post mod 4 by ununseptiumwarehouse

KORG Poly 800 with Moog Slayer Mod & Blue Display

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korg Poly 800 Synth with Moog Slayer Mod

YouTube Uploaded by AlexisG73 on May 13, 2007

Korg Poly-800 II - UNIQUE - Moog Slayer, FM Mods, Audio IN, BLUE LEDs

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via this auction - learn how to sell on eBay here

"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!.."

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How To Instructions on Korg Poly 800 Moog Slayer Custom Modded Analog Synthesizer Keyboard

Published on Apr 27, 2014

"A video showcasing the Moog Slayer mod for the Korg Poly 800 analog synthesizer. You can achieve amazing results with just simple tools and basic soldering skills.

Details of the custom synthesizer mod can be found here: http://synthmod.net/korg/moog_slayer/
http://synthmod.net/korg/fm800/

More details:
http://www.strellis.com/poly800.shtml

Background music is Washed Out - Paracosm (2013)"

Korg Poly800 Synthesizer Keyboard with Hawk800 Mods & More

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via this auction

"Korg Poly800 Mark 1 Synthesizer

with loads of mods making an extreme uber synth with full MIDI spec and loads of new parameters:

The knobby hardware mods were professional installed by Circuitbenders.co.uk:

The "Moog slayer" mod which allows extreme filter resonance and manual control: Cutoff knob, Resonance knob, 12/24db switch.
The "FM800" mod : Source switch, FM Modulation depth knob
Audio Input: Level Knob, Path switch, Filter CV socket.
Hawk800 and Atomahawk boards both installed with all these extra features:

full MIDI spec whereas the original Poly800 had none.
Loads of new parameters: 4 LFOs, many LFO shapes, masses of modulation routings possible, free running or not.
Flash memory so no internal battery required.
7 sequencer memories (originally 1).
MIDI velocity sensitivity.
Moog Slayer and FM800 mods also included so they can be MIDI controlled.
Portamento Mono mode.
4 patch banks
and much much more.
All these mods turn the friendly Poly800 into an extremely versatile and deep synthesizer.

The synth itself is in good condition with the usual minor scratches of something this age. Supplied also is a printed Poly800 manual (not original) and Hawk800 manual, plus PSU."

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Korg Poly 800 with Moog Slayer and other filter mods plus a built in BSIAB II

Uploaded on Jun 29, 2011 sizzlemeister

"Korg Poly 800 with Moog Slayer mod, Filter Frequency Modulation mod, 12/24 db Filter switching, and a BSIAB II grafted into the former chorus circuit. I picked up this Poly 800 at a yard sale and it was in very bad shape, so I gave it bath and fixed it up. It needed the power section rebuilt and some other work, plus the joystick knob was missing so I replaced that. I added an internal battery for the memory."

Siel DK70 Analog Synth with Moog Slayer mod

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via this auction

"A previous owner installed the 'Moog Slayer' filter mod, which adds knobs for real time control over filter parameters (see photos). This is similar to the mods often installed on the Korg Poly-800 and gives you some hands-on control that would usually be lacking. It's a subtle effect but very useful on a synth that otherwise would be difficult to program..."

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korg ex 800 with moog slayer mod and more

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"Modified with the MoogSlayer filter mod, FM mod, External Audio in mod, internal feedback mod, and a couple others. Knobs aren't labeled, so I will include an instructional diagram. Comes with original power supply and rack ears. Sounds great, but I rarely use it anymore. I have too much gear, not enough space. Unit is totally functional, the filter is insane, but it is an old piece of gear and my mods aren't manufacture grade, so all sales are final. Guaranteed to not be D.O.A."

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Korg Poly 800 with Mods

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via this auction

"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.

(From circuitbenders.co.uk)

The Korg Poly800 and its rackmount / tabletop cousin the EX800 are odd beasts. They came from that strange era of Korg synths where they couldn't seem to decide between analogue and digital, and so came up with a selection of hybrid synths that didn't seem to excel as either sound. On paper the Poly800 was a pretty well endowed machine but in reality it always sounded a little thin and never really fulfilled its potential, which is where we step in with our Polybeast mods!

FILTER MODS:

Cutoff & Resonance Knobs: This mod can be found around the net under several different names (Moog Slayer Mod) and versions but essentially it adds knob controls for the filter cutoff and resonance parameters for realtime control. The resonance knob can take the resonance well into self oscillation and far beyond what is programmable from the front panel. This can produce the kind of screaming top end and subsonic bass that gives these machines a whole new range of sonic possibilities. The filter cutoff knob allows you to perform long filter sweeps for those squidgy burbling analogue lines that you knew your Korg was capable of but could never actually program. Both parameters are still also controlled by the normal programming methods which can set the range of the knobs control.

12dB / 24dB Filter Response Switch: Somewhat mysteriously the filter chip used in these machines has both 12dB/Oct and 24dB/Oct outputs but only the 24dB one is actually used. This mod adds a switch to select either a 24dB or less drastic 12dB filter response

VCF CV input: This socket round the back of the machine adds an external 0-5v control voltage input that controls the filter cutoff. The new filter cutoff control knob is disabled when a jack is plugged into the socket.

AUDIO MODS:

External Audio Input: This accepts a line level audio signal and inserts it before the filter and chorus effect so you can use it to process external signals. The input is set up so that a loud signal will slightly overdrive the filter for a dirty sound.

External Audio Path Switch: This switch sends the audio from the external input either via the DCO1 or DCO2 signal path or turns it off completely. The input doesn't respond to the DEG audio level envelopes but instead is gated on and off by the noise gate that korg implemented to silence the synth when all the envelopes are completely closed. i.e. when the DEG envelope for the chosen path closes completely at the end of the release phase, the noise gate is activated and the external audio input is cut. The audio input is still effected by the filter envelope.
An external input can easily be filtered without having to hold down a note by setting up a patch with all the oscillator tones turned off, but the DCO 'level' parameter set to full. If you use the note 'Hold' function and press a key the audio input will be audible and can be processed with the filter etc.

Input Level Knob: Its a knob that controls the level of the audio input. What more can we say?

FM MOD:

Essentially VCF FM allows you to modulate the filter cutoff at audio frequencies to create all kinds of clanging cross modulation and bizarre alien splatters & sweeps. This effect works best with the resonance cranked up into self oscillation which is where the new resonance knob mod comes into its own. The audio input takes its signal from before the input level knob so you can use the audio to modulate the filter cutoff but remove the actual audio signal from the mix.

Also installed is a brand new internal memory battery to keep this machine running for years and years without losing your presets!"

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Korg Ex-800 poly analog synth with Hawk and Moog slayer upgrade

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"Here is vintage Korg Ex800 synth upgrade with the Hawk 800 and Atomahawk (moog slayer) mod. Serviced and professionally installed."

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Korg Poly800 with Original Blue Gig Bag & Moog Slayer Mod

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via this auction

"This particular example has had the so-called 'Moog-Slayer' mods installed. This means there is a dedicated knob for the analogue filter cut-off and resonance. It makes a huge difference to the hands-on operation of the synth.

It also comes complete with it's original padded soft case, in a very fetching 1980's baby blue and orange."

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Modified Casio HT-700 with Drum Pitch and Moog Slayer Filter Mod

via this auction

"modified Casio HT-700 Synthesizer with Moog Slayer filter mods and Drum Pitch mods. The filter mod is MUCH better than the one done on the wimpy Poly 800, and the drum pitch is insane! The filter mod allows you to adjust Cutoff and Resonance in REAL time, and the VCA is analog."

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KORG POLY 800 with Slayer Mod

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via this auction
Rhythm Active (RSS)

"Moog Slayer Mod

Modifications include a hands on knob for:
Filter Cutoff Frequency
Filter Resonance
FM Filter Cutoff Frequency"

Korg EX-800 with HAWK and AtomaHawk Upgrades

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via this auction

"The original EX-800 had only a very basic MIDI implementation and also had somewhat limited sound modulating abilities. The HAWK and AtomaHawk kits bring so many new features including total MIDI control of every parameter. And the number of parameters is nearly doubled. There are four LFO's (2 LFO's and 2 SLFO's) instead of just one. The resonance, moog slayer and FM-800 mod's are part of the AtomaHawk upgrade. So you get all of those mod's and also the 12/24db per octave mod is included too. What really makes the difference is having those mod's under MIDI and patch memory control. Now you can use envelope generator 3 and any of the four LFO's to control the mod's. There is also MIDI velocity sensitivity, portamento and many, many more features including harmonic modulation. You also get 256 patch memory in 4 banks of 64. And all data is stored in flash ROM so you can forget about battery replacement and rest easy about battery leakage causing damage since you don't need an internal battery at all..."

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Korg Poly-800 Moog Slayer Mod

Just saw this on the Vintage Synth Museum boards. It's a DIY mod for the Poly 800 that adds knobs and increases the range of the filter. From the site:
"This thing can do dangerous sounds, like the speaker-blowing (and ear-blowing!) sounds of old modular synths. It's really sick.... In addition to the usual disclaimers (if you break it, it's your problem, not mine!), I'd like to also point out that I will not be responsible for blown speakers, amps & ear-drums." Hard to beleive but it did score high marks from some who have tried it.

Update: I was trying to figure out what looked off about the picture below other than the mod. I didn't think the Poly 800 had volume and speed pots of the same design of the Polysix and I don't remember a tune pot, then I realized, duh, the picture is the EX-800, the Poly-800 desktop unit.

Korg EX-800 Polyphonic Desktop Synth (Filter Mod + FM [Moog Slayer] w/ PSU)

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via this auction

"Vintage Korg EX-800 polyphonic MIDI desktop synthesizer. It features an analog filter and chrous modifying 8 DCOs, 2 LFOs, and 3 Envelope Generators. The unit also contains a built-in sequencer. In addition to the stock functionality, the Moog Slayer filter cutoff/resonance mod has been added as well as a frequency modulation knob."

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