Sequential Prophet 600 SN 4909 w/ Gigli Mod

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via this Reverb listing

"Sequential Prophet 600 Synthesizer with the GliGli Mod.Includes GliGli overlay (installed), hard case and dust cover."

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Sequential Prophet 600 with GLIGLI Mod SN 2524

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via this Reverb listing

"Beautiful Prophet 600 with GLIGLI mod and mod instructional sticker. Unit is in great shape and sounds lovely. Has the latest GLIGLI Mod update installed on the ship, so there are new features that are not listed on the sticker (new graphics are available on the GLIGLI website). The unit also features brand new real wooded sides with a really nice finish."

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Sequential Circuits Prophet 600 Polyphonic Analog Synthesizer (Gligli CPU mod)

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via this listing

Additional Perfect Circuit listings

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GliGli's Overcycler Demo

video upload by Ticco Ross

"When I heard that the guy that designed the famous Sequential Circuits Prophet 600 mod was going to release a low cost synthesizer based on the ssm2044 filters, I knew right then that it was going to be an amazing project.
A man only design, develop and build project. With its own sound makes this a unique synth with a lot of possible modulations functions. Here you can hear some patches I made with it."

You can find additional Overcycler posts here.

SEQUENTIAL CIRCUITS PROPHET 600 GLIGLI DEMO

video upload by Synth Tailor Electronics

"Here's a Sequential Circuits Prophet 600 that had lots of issues when it arrived at the shop! It was severely out of tune, had lots of battery corrosion/leakage on one part of the CPU board. Lots of love went into restoring the CPU board, Membrane/Front Panel pot boards (every slide switch was replaced due to corrosion.)

After a full restoration we installed the GLIGLI mod, and flashed/sent new GLIGLI presets to the Prophet 600. These synths easily get looked over, but they sound incredible.

This P600 was fitted with Techs Mechs Vintage Synth FATAR keybed and Prophet 5 style knob caps.
The P600 is hooked up to Death BY Audio's 'ROOMS' Reverb pedal straight into an interface!"

Sequential Circuits Prophet 600 Synthesizer w/GliGli Upgrade SN 4589

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via this listing

"The Prophet 600 is a good synthesizer, but with the GliGli CPU upgrade installed it becomes a great synthesizer! One of the best vintage synth values out there today.

This Prophet 600 is in good working order and has been upgraded with the GliGli mod running the 2.0992 firmware revision (GliGli's final version), a new membrane panel, a new set of Synthchaser key contacts, and a new set of knobs. All 6 voices are tuning, scaling and sounding great.

Very good physical condition, some wear/chips on the side panels (see photos)."

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Sequential Circuits Prophet 600 SN 1849 w/ Teensy & Gligli Mods, Custom Cover & Case

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via this listing

"This Prophet 600 has the Teensy ++ Gligli mod which simply improves the MIDI features and overall sound of the Synth. All of the keys are responsive. Each control and parameter is working properly as well. In all, everything is fully functional and in excellent working condition."

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Sequential Prophet 600 clone on proto board with Gligli upgrade

video upload by Craig Barnes

"A complete clone of a Sequential Prophet 600 built into a CME UF60 case, push buttons were used instead of the membrane. AS3372E chips were used instead of the standard AS3372 which are expensive and hard to find. Total cost around 600 euros and a month to build on and off."

Stunning DIY VST Controllers by Craigyb

This one is in via Florian Anwander via the Sequencer.de forum.

According to the creator of these controllers, Craigyb:

"So when I was 16 (around 45 years ago) I used to dream of the Arp Quadra. A friend of mine who wasn't a keyboard player, but just wealthy bought one and it was sat in his front room doing nothing unless I could call around after school and have a play on this great synth.

Now I know I could probably afford to buy one, but the wife would kill me quicker than the Russians, so instead I took Cherry Audio's VST of the Quadra and created a physical beast with a PC built in to create sounds.

I then followed that up with a synth that I've never met in real life AFAIK but is also quite legendary, the Elka Synth (again a VST emulation by Cherry Audio).

I'm currently working on the Memory Moog version (MemoryMode by Cherry Audio) and I just need to finish the actual hardware as the software controller is complete."

Further below are a few more creations from Craigyb in a separate thread on the Sequencer.de forum here.

"This is a small collection of some of the real synths and accessories I have built over the last 4 years.

Details of most of the schematics and code can be found on my GitHub page http://github.com/craigyjp

A Roland A110 clone
Rack version of a VA polysynth with extras
A rack version of the MiniDexed
A Dual DCO monosynth based on Hagiwo VCO
6 voice polysynth based on the Polykit
16 voice bitimbral rack mount
FV1 based rack mount effects with memory
Gligli Prophet 600 clone with extras
Mellotron sample playback synth
Source inspired monosynth with memories
8 voice poly again Hagiwo DCO based
A 6 voice VCDCO based poly with memory
Dual XVA1 synths and editor in one keyboard
A MIDI analyzer/converter/injector USB and DIN
Roland MKS30 display upgrade to OLEDs
Arturia CS80v editor/controller
OSC Oscar Clone"

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Custom 'Black Prophet' Reverse Keys Sequential Circuits Prophet 600 SN 440

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via this listing

"Prophet 600 customized 'Black Prophet':

- reverse keys

- Prophet 5 metal cap knobs

- now discontinued GliGli upgrade installed

- darker wood cheeks

- brand new original CEM3340 Rev G VCOs"

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Wine Country Sequential Circuits Prophet 600 GliGli SN 2682

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via this listing

"This is a wine country “perfect prophet” which has been recently serviced having its pots and switches cleaned and lubricated. It has the gligli modification with the Imogen 2022 code. The brief video demonstrates power up, key triggering and sound sounds. Introducing the Sequential Circuits Prophet 600, a classic vintage analog synthesizer that has been fully serviced and is in great working condition. This keyboard synthesizer features 61 synth keys, with CV In, MIDI (DIN) In, and MIDI (DIN) Out input/output ports for easy connectivity. The Prophet 600 is a top-of-the-line model from Sequential Circuits, with a range of features including a pitch wheel, modulation wheel, and arpeggiator. Ideal for both beginners and professional musicians, this Sequential Prophet 600 is a must-have for anyone looking for a high-quality analog synthesizer. Its stylish design and reliable performance make it perfect for use in any musical setting. So go ahead and create your masterpiece with the help of this amazing synthesizer today!"

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Sequential Circuits Prophet 600 Serviced With GliGli SN 4421

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via this auction

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Sequential Circuits Prophet 600 Synthesizer With GliGli Mod SN 4894

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via this auction

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Sequential Circuits Prophet 600 SN 874

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via this auction

"Completely re-capped in 2019, with new lithium battery installed at that time. Includes Forge (by Anvil) hard case, original manual, and gligli mod installed (but also includes original chip). Sounds amazing, and everything works as it should."

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Behringer Pro 800 vs Prophet 600 // SOUNDS ONLY

video upload by Starsky Carr

"While I'm putting the finishing touches to my full comparison video here's some sounds to demo the similarities and differences between the Behringer Pro-800 and an original vintage Prophet 600 with the GLiGLi upgrade.

Simpler tones can be copied easily as the raw tone is all there in the oscillators. The filter envelope amount, sustain and cutoff work together slightly differently than the original so adding filter envelopes makes things a little more difficult, add to that the linear envelope shapes aren't the same - GliGLi updated the linear model in 2022 to reflect a more natural Prophet 5 Rev1/2 curve but this isn't in the Behringer. Plus Behringer have made the Pro-800 snappier, so the envelopes are not going to match on every occasion... not an issue in any way, every Prophet 600 with different GliGli firmware will be slightly different I imagine too... unless everyones updated to the 2022 version.

Other differences include the Poly-Mod, filter and LFO modulation ranges aren't as wide in the Behringer"

Sequential Circuits Prophet 600 With Gligli SN 4464

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via this auction, also on Reverb

"Sequential Circuits Prophet 600 with gligli upgrade in full working condition. Amazing sound and the v2022 gligli firmware update turns this 600 into a hefty Prophet 5 contender. More routing options, more LFO and lfo routung, Prophet 5 type envelopes, "rebounce" that prevents double triggering, more stability, better tuning and so much more! The overlay on the left side of the data membrane panel is for gligli 2.0 but will send a manual of the v2022 update that explains all the routing, operation and execution of all the v2022 functions... that said, most of the text on the 2.0 upgrade is still as it is stated."

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Sequential Prophet 600 61-Key 6-Voice Polyphonic Synthesizer w/ Upgrades

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via this auction, also on Reverb

"Excellent condition, new wood ends, GliGli mod installed with original OS chip taped to the inside, latest RAM module installed, Synthgraphics GliGli overlay, Techsmechs Fatar keybed and upgraded Knob cabs, the whole deal! I also bought the panomod kit but never got around to installing it. It's included in the sale."

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Sequential Circuits Prophet 600 SN 1866

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via this auction

"This synth has the GliGli Mod installed. (I will also include the original Z80 chip that was in the synth before the GliGli Mod was installed.) I purchased this synth 4 years ago from the Vintage Vibe Electric Piano Co. It has left my studio only a handful of times since then and it functions perfectly. All switches, pots, and buttons work great and actuate as they should (i.e., smoothly and efficiently). The keys are in excellent condition. It sounds incredible and has a character that can't be captured with modern synths. The PolyMod is wicked cool and allows for some synth effects that are truly unique. I have listed the condition as "Excellent" because the synth is in great shape - but there is one noteworthy cosmetic imperfection: the left side (bass end) wood panel has been significantly scratched (it was like that when I purchased it from Vintage Vibe). I have highlighted this in the pictures. It lends character to this instrument and has zero effect on the instrument as such - and can be remedied by replacing the wood side panels with replicas of your choosing or design. The synth comes with the road case featured in some of the pictures and with a power cord. The road case is old but it is still functional and protective."

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SCi Prophet-600 w/ Gligli Firmware

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via this auction

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Sequential Circuits Prophet 600 Synthesizer SN 3967

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via this auction

"Fully functioning and restored - Sequential Circuits Prophet 600 Synthesizer.. The unit was not working and I held on to it since then. I decided last year in March to have it repaired. It would light up but not boot to program mode. I sent the unit to one of the absolute best technicians possible for this type of instruments. The unit was sent to David Sesnak of Wine Country Productions in San Jose, California. He could not believe how great the condition of this unit was cosmetically. All repairs he made totaled $746. I had him install the GliGli update as well. The wood sides are original."

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