Prophet 600 Synthesizer GliGli - Seven minutes of Ethereal Pads!

Published on May 10, 2020 Tom Loncaric

"This Sequential Circuits Prophet 600 synthesizer was made in about 1983. It features the GliGli mod, which wonderfully upgrades the potential of the instrument. The music in the video was performed live with no overdubs. Effects used are slight analog delay and reverb.

Equipment used:
Sequential Circuits Prophet 600 synthesizer with GliGli mod
Moog Minifooger delay
Demeter RV1 Real Spring Reverb"

Overcycler DIY 6 Voice Hybrid Synthesizer from GliGli - Maker of the Prophet-600 Firmware Update

SoundCloud description: "All sounds coming from my DIY synth, no effect, spatialization is built-in. As you can hear in this demo, it's very versatile, from huge analog pads to gritty digital sounds, going through all the inbetween possibilities. A great addition to my other analog synths!"

This one in via Soviet Space Child, via reddit, posted on June 24, 2015 by sfxgligli:

"It's a 6 voice polysynth. Each voice is 2 wavetable oscillators into a VCF into a VCA. I deliberately made it so the oscillators can strongly overdrive the SSM2044 filter, which stays very musical and smooth even when overdriven (eg you can hear it on the opening arpeggios). The voices are also panned left to right on the stereo output to get some spatialization."

Note the synth appears to have been completed back in 2013 based on the date of the demo above as well as previous posts on the GliGli website.

You might know GliGli from the P600fw firmware update for the Prophet-600 and the Matrix 1000 ROM upgrade. This 6 voice DIY hardware hybrid synth is called Overcycler. Some of the work behind it actually made it's way into the P600fw update.

From October 9, 2013:
"It will be:
- An expander, in a slanted box.
- 6 voice polyphonic with separate outs, 4 part multitimbral.
- Hybrid , two 12bit DACs per voice (wavetable oscillators for now), one SSM2044 filter, and 1/4 of SSM2164 VCA.
- Using a 20x4 characters LCD / 16 keys keypad / 10 potentiometers user interface.
- Using relatively simple hardware, strongly based on the KISS principle :)
- Having a strong character, each stage will allow some overdrive (filter, VCAs, ...)

I learned a lot while working on the Prophet 600, and I thought it could help me design a slightly different synth from the usual analog ones, more or less inspired by the PPG Wave.

Nothing groundbreaking, Mutable Instruments have done this for a while, but I had an unused set of SSM2044/SSM2164, and I wanted to see how far I could go in simplifying a polyphonic hybrid synthesizer."

Prophet 600 Gligli Demos

Published on Mar 6, 2015 chris962x

Prophet 600 Gligli

Prophet 5 + Prophet 600 | Matt Chadra

ClavAnother

"Prophet 5 Rev 4 connected to a Prophet 600 (Gligli) Eleven voices of fun, I'm playing six note chords, and I have no idea where the stolen Prophet 5 voice is going - let me know in the comments if you can hear it."

GLIGLI Teensy++ CPU SEQUENTIAL CIRCUITS PROPHET 600

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

via the listing (link to audio demos below): "This monster has also just been outfitted with the new and super secret, highly classified GLIGLI Teensy++ CPU and firmware upgrade, which basically makes it better than a Prophet 5!!! I'm Including links and samples of the mod, but it unlocks the true potential of the Prophet. This is the forst and only GLIGLI equipped 600 on the market! The 600 is one of my absolute favorite synths of all time. It is just mean and big and powerful and NASTY! It is so versatile, unique and relatively inexpensive, I have no idea why you would buy a prophet 5. Wicked filters, poly-mod, (like cross mod on a korg mono/poly, -my other fave synth) and 100 patch memory and midi; this beast has it all. HUGE pads, SEARING leads (especially when in unison), and earth shaking basses. WOW. With the upgrades? WOW WOW."

The upgrade features:
Non-destructive firmware drop-in replacement of the new firmware.
Greater resolution of many of the sound parameters with an improved refresh rate that is making the instrument much more responsive.
Faster, smoother amplifier and filter envelope generators supporting four different modes:
Fast Linear
Slow Linear
Fast Exponential
Slow Exponential
A new LFO function generator with a wider range from one cycle every to about 60Hz with four new waveforms in addition to the original triangle and square including sine, random stepped, noise (like on the original Prophet 5, but non-periodic) and sawtooth (ramp up)
Multiple keyboard modes including:
Poly first note priority
Unison (all voice) Hi-key priority
Unison (all voice) Low-key priority
Solo (one voice) Hi-key priority
Solo (one voice) Low-key priority
Mix Overdrive which now allows the output from both oscillators to drive the mix
Pitch Wheel interval selection of plus/minus one octave, a minor third and a fifth
Pitch Wheel reassignment to the VCF and Volume or off
Modulation wheel intensity setting from Maximum to Medium to Minimum
Full Midi In control including:
Amp and Filter velocity sensitivity with an external keyboard controller
Continuous Controllers (CC) of all sound parameters
Program change (PC) to choose current preset
A new and improved tuning procedure
Chromatic and free Oscillator course pitch control
Plus/Minus setting for Oscillator Fine Tune and Filter Envelope amount for Poly Mod and Filter
Assignable, Random And Up/Down Arpeggiator
Debounce feature that prevents unintended retriggering caused by the old keyboard

Audio demos previously posted here.

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Sequential PROPHET 600 Analogue Synthesizer!☆ w/ Teensy CPU SN 1573

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via this auction

"This already great sounding twin VCO analogue synthesizer benefits from having the incredible GliGli/Teesy CPU and firmware upgrade installed. This has turned the Prophet 600 into a truly amazing polysynth...it easily competes with the Prophet 5 and in my view actually sounds nicer...I've always prefered them sonically even before the upgrade..but now this synth is on a whole new level! Super fast enevelopes, super high pot resolution(no stepping), fully MIDI control..plus a whole host of new sonic possiblities!

Prophet 600 Manual, GliGli Upgrade manual and power lead all included. Comes loaded up with all the original factory presets as described in the manual!

It has also been serviced and calibrated for sale and is ready to go. No scratchy pots or leaking caps or anything else and All features work fully and have been thoroughly checked, including all foot-switch operations."

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Sequential PROPHET 600 with Teensy Upgrade SN 4060

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via this auction

"This already great sounding twin VCO analogue synthesizer benefits from having the incredible GliGli/Teesy CPU and firmware upgrade installed. This has turned the Prophet 600 into a truly amazing polysynth...it easily competes with the Prophet 5 and in my view actually sounds nicer...I've always prefered them sonically even before the upgrade..but now this synth is on a whole new level! Super fast enevelopes, super high pot resolution(no stepping), fully MIDI control..plus a whole host of new sonic possiblities!

Original Prophet 600 Manual, GliGli Upgrade manual and power lead all included. Comes loaded up with all the original factory presets as described in the manual!"

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Sequential Circuits Prophet 600 SN 5371

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via this auction

"So yes, it seems to work great with the original Z80 CPU, but it behaves a little strangely with the mod installed. Basically, with GliGli, oscillator pitch seems slightly erratic and janky. Sounds a little like random/noise modulation. Sometimes you can hear it on the first note you play, sometimes you can't hear it until you have played all six notes. Even weirder, this issue also goes away a bit when pitch bend is not perfectly centered. I think a multiplexer IC on the front panel PCB might be causing these problems, but since It doesn't have this issue when it's stock, I'm not so sure. I haven't messed with it. I'm including a couple replacements just in case.

I bought my GliGli mod from a pro builder on Reverb, so I don't think it was assembled/soldered together wrong. I'm pretty sure I installed it correctly as well! I'm stumped.

This synth also had a slight whine in the signal path when I first got it, but after I installed GliGli it went away and never came back, even after I reinstalled the original CPU this evening. Even when it was present, it wasn't too noticeable. (Hopefully it won't return!)

Cosmetics and other info:
This Prophet, serial number 5371, was built some time in mid-1984 and is in really beautiful cosmetic condition. A couple signs of use here and there but nothing very noticeable. Some of the lower black keys are a little dull-looking compared to the rest. Two front rubber feet were missing so I replaced them with adhesive ones. A GliGli "cheat sheet" from Synthgraphics is also now on the front panel.

All keys work!! Battery seems to be holding patches fine as well.
If you haven't had a Prophet 600 before, be aware that (when it's stock) it takes several seconds to boot up and tune each voice. This is normal!"

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Prophet 600 Gligli TD Patches Demo HD

Published on May 27, 2016 jonathan bruno

"Some custom patches (Inspired by Tangerine Dream) on my newly acquired Sequential Circuits Prophet 600 with Gligli processor upgrade. Among the many improvements there are 2 that stand out. Much improved envelopes and the ability to overdrive the oscillators through the filter. Resulting in a very prophet 5 like sound"

Sequential Circuits Prophet 600 w/ New Wood Sides & Upgraded CPU SN 5620

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via this auction

"Here is a beautiful and fully operational example of a Sequential Circuits Prophet 600.
This unit has been meticulously serviced and upgraded to bring it to it's absolute fullest potential.
All of the insides have been perfectly calibrated and tuned. All tantalum capacitors have been changed with high quality electrolytic, a common flaw in all sequential gear. All controls have been cleaned and the membrane pad works perfectly. The keybed, another common ailment of prophet 600's, has been serviced to ensure it will not loose notes.

The unit features 2 upgrades:

Brand new custom made wood sides

GliGLi CPU modification, which is the mod that makes these prophets scream as loud as it's older the brother, the prophet 5."

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SCI Prophet 600 with new CPU and gligli firmware

Published on Mar 6, 2014 MrFirechild·44 videos

"The track is made using sounds from the Sequential Circuits Prophet 600 Vintage analog synthesizer from 1982. However this particular Prophet 600 is using a new Teensy++ CPU and new firmware, thanks to gligli and his amazing P600fw project! The track will be available on a Firechild album mid 2014."

Prophet 600 Synthesizer - GliGli mod *Custom Patches* - rez pads, brass, clavs - Sequential Circuits

Tom Loncaric

"More sound examples featuring the incredibly versatile Sequential Circuits Prophet 600 six-voice polyphonic synthesizer. Lots of vintage inspired patches! This video focuses on resonant pads, brass and clav tones, with a little extra spice added. My Prophet 600 was made in about 1983, and features the GliGli mod, which is a significant upgrade.

All sounds in the video were programmed by me and performed live, in the spirit of the big keyboard tones of the 1970’s and 1980’s.

Effects:
Demeter RV-1 Real Spring Reverb
Moog Minifooger Delay"

Additional posts featuring Tom Loncaric

Sequential Circuits Prophet 600 Analog Synthesizer with Gligli SN 4636

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via this auction

via the seller: "Excellent condition and fully functioning SCI Prophet 600 6 voice 61 key analogue synth. I have upgraded to the Gligli mod. Included is a second Teensy ++ board, spare knob/potentiometer, and the original CPU if you ever want to reinstall it. The Prophet 600 stayed in a studio its whole life and was never gigged."

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SCI Prophet-600 Raw Filter Tweaking Arpeggio Captured in Sequencer

Published on Aug 17, 2014 LANDOSONIC

"Eine 3-minütige Studie des rohen Filter Sound des Sequential-Circuits Prophet-600 Vintage Analogsynthesizers. Ausser einem Master Limiter trocken (ohne Effekte) aufgenommen. Beachte: Kein kompositorisches Wunderwerk, lediglich eine Sounddemonstration.
This Prophet-600 is equipped with the "Teensy" CPU Upgrade by Gligli."

Sequential Circuits Analog Prophet 600 Synth with Gligli and Overlay

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via this auction

"This Prophet 600 is in excellent condition. Has the Gligli mod, plus a Gligli panel overlay by SynthGraphics affixed to the panel. The overlay displays the correct functionality of the knobs and buttons that the Gligli mod introduces. These are no longer available so it's a wonderful rare feature to have.

Synth is fully functional, and all knobs, buttons, keys, etc work properly with no issues. The cosmetic condition is also excellent with hardly any scratches. Please see photos. There are a few nicks on the wood sides that can be seen in the pics. The person I bought it from told me he purchased it from a vintage synth museum. It is hard to believe it is nearly 40 years old.

This particular synth has given me more pleasure than any other poly synth I've owned, but I'm abandoning my synth/midi setup and going back to basics with a Wurlitzer and analog tape deck."

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Sequential Circuits Prophet 600 with Gligli Mod SN 2226

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via this auction

"The is a 6-voice polyphonic analog synthesizer released in 1982. It was the first commercially available synth to include MIDI functionality. The 600's analog voice's are controlled by a Zilog Z80 CPU. Though state-of-the-art at the time of its release, the Z80's specs means the synth feels limited and slow to respond to changes compared to modern instruments. Luckily, synthesizer enthusiast & engineer has written for the Prophet 600, designed to run on a . Replacing the 600's Z80 with a Teensy++ running Gligli's firmware adds a long list of features to the classic synth, including:
Increased resolution for sound parameters
Faster, smoother amplifier and filter envelope generators
New LFO function generator with a wider range
Dedicated vibrato
Unison detune
Mix Overdrive
Full Midi In control of parameters
Improved tuning procedure"

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Sequential Prophet-600 Programmable Analog Synthesizer Gligli Update SN 5695

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via this auction

"Sequential Prophet-600 Programmable Analog Synthesizer with Gligli Update

This one is in very nice cosmetic condition (see the pics). Its power supply was recapped a few years ago with new electrolytics.

It also has the gligli update with the stable latest/final2.0 firmware. The gligli update really transforms the performance of the stock P600, as well as adding many new features."

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MIDI Designer Pro iPad Editor for the Sequential Circuits Prophet 600 & New GliGli OS

via MIDI Designer

Load it here after installing MIDI Designer Pro [iTunes].

"The now famous GliGli firmware update for the perennial Sequential Circuits Prophet 600.

The runt of the Sequential litter, first to midi, and never much thought of until.... some strange dude took it upon himself to completely rewrite the os and breathe new life into this old dog.

My layout is far from perfect and has not been extensively tested but I think everything functions as should. I have not implented the fine control because there was considerable audible stepping on some important function such as cutoff freq. Not sure if it's software, hardware or MD user related but for now it will have to do.

Everything provided by midi implementation is there, it's nice not to have to interact with the number pad for access to all the new and truly amazing functionallity the gligli firmware provides. The membrane pad is probably one of the few parts that will be harder to replace as time goes on and also one of the most vulnerable to damage. Anywho all the new LFO shapes, assigning the wheels, changing Env response curves, and adjusting and viewing +/- values are much easier now.

I would love some help with this one if anyone wants to check it out, make sure it's working, and maybe help with adding fine control with the extra cc.

Thanks to Gligli for the now indespensible new os, an awesome project he's done with absolutely no compensation whatsoever. THANK YOU!"

Sequential Circuits Prophet 600 Analog Polyphonic Synthesizer GliGli ProServiced SN 1494

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Sequential Circuits Prophet 600 with GliGli Chip Update installed.

The GliGli update basically it adds many new functionalities, such as making the envelopes punchier and adding more arpeggio settings..."

You can find demos and details on the GliGli upgrade in the archives here.

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MIDI Designer Template for Sequential Circuits Prophet 600 with GliGli OS

Template submitted on the MIDI Designer site

"The now famous GliGli firmware update for the perennial Sequential Circuits Prophet 600.

The runt of the Sequential litter, first to midi, and never much thought of until.... some strange dude took it upon himself to completely rewrite the os and breathe new life into this old dog.

My layout is far from perfect and has not been extensively tested but I think everything functions as should. I have not implented the fine control because there was considerable audible stepping on some important function such as cutoff freq. Not sure if it's software, hardware or MD user related but for now it will have to do.

Everything provided by midi implementation is there, it's nice not to have to interact with the number pad for access to all the new and truly amazing functionallity the gligli firmware provides. The membrane pad is probably one of the few parts that will be harder to replace as time goes on and also one of the most vulnerable to damage. Anywho all the new LFO shapes, assigning the wheels, changing Env response curves, and adjusting and viewing +/- values are much easier now.

I would love some help with this one if anyone wants to check it out, make sure it's working, and maybe help with adding fine control with the extra cc.

Thanks to Gligli for the now indespensible new os, an awesome project he's done with absolutely no compensation whatsoever. THANK YOU!"

iTunes: MIDI Designer Pro - Confusion Studios LLC
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