Sequential Circuits Prophet 600 Analog Polyphonic Synthesizer GliGli ProServiced SN 1494

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"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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Sequential Circuits Prophet 600 W/ Gligli Chip Update SN 2193

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"Recently serviced, calibrated and battery changed and GliGli update added.

In case you do not know about the GliGli update basically it adds many new functionalities, such as making the envelopes punchier and adding more arpeggio settings."

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Sequential Circuits Prophet 600 with Gigli upgrade

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"Fully functional, all the knobs, keys and buttons work as they should. Great synth for lush pads, funky basslines and cosmic sound fx and all the fun unpredictability of an old vintage synth. I really love the gigli upgrade beacuse increases the reslolution for sound parameters, faster amd smother filter envelopes, improves the tunning procedure and it has full midi in control of parameters."

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Sequential Circuits Prophet 600 Vintage Analog Synthesizer Synth with Upgrades

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"Beautiful Prophet 600 with the latest firmware update from Gligli and a fresh membrane panel from LA Synth Co (installed 3 months ago).

- Original wood ends have been lightly sanded and finished.
- I will include the original IC with the factory firmware
- Keybed is in pretty good shape, the keyboard bushings were replaced a year ago."

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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 Synthesizer w/ Gligli OS SN 015

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"Keyboard has the gligli OS mod installed which basically modernizes the operating system and upgrades the processor to fix the flaws that have plagued the P600 since it was released. Key improvements are faster envelopes (with adjustable envelope curves) as well as fast knob resolution to eliminate zippering..."

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Sequential Circuits Prophet-600 Synthesizer SN 860 with Gligli Upgrade

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"The Prophet-600, introduced by Sequential Circuits in 1982, was the first synthesizer to use MIDI and was used in the first public demonstration of the MIDI protocol. It has recently seen new life after a fantastic processor replacement build was made public last year"

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Sequential Circuits Prophet 600 with Gligli CPU UPGRADE

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SCI Prophet-600 with GliGli's firmware update

Published on Oct 22, 2015 Martin Ottesen

"This is a few sound examples from my Prophet-600 with GliGli's firmware update. With this update the synth is one incredible analog polysynth. For more info: https://gligli.github.io/p600fw/

https://www.nomatisan.com"

Sequential Circuits Prophet-600 analog synthesizer with P600FW update

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"Sequential Prophet-600 with latest of Gligli's P600FW firmware installed. It gives new life to the instrument with many new features and snappy envelopes. All functions working and sounds incredible."

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Sequential Circuits Prophet 600 with Gligli teensy++ Mod

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via the seller: "This unit is in IMMACULATE condition. It was cleaned and serviced one year ago. All keys and knobs are in excellent condition. Physically the unit looks very close to brand new and has never left my smoke free home studio."

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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."

Sequential P600 + Gligli upgrade - Harlem Nights

Published on Dec 28, 2014 harlemnightsmusic

"Had this synth for some time while my Prophet 5 got some modifications. These are some personal sounds I made from this 80s synth, with new firmware, more info here: gligli.github.io/p600fw/.

Some delay and compression used. The upgrade gives better envelopes, LFOs and many other things. It does not get as warm as the Prophet 5 rev 2 but then nothing really compares

Back soon with more

HN"

Sequential Circuits Prophet 600 w gligli CPU Upgrade SN 2296

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"The classic now with updated cpu, lightning fast envelopes and knob twiddling with no noticable stepping! Besides the usual cosmetic issues of a 30 year old machine, everything about this p600 works flawlessly. Keys all trigger as they should, membrane buttons are 100% and a joy to use, and since ive had it the knobs and switches all great from a few treatments of deoxit faderlube..."

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Sequential Circuits Prophet 600 Analog Synthesizer with GliGli OS Upgrade

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"Recently serviced (and is working great!) and upgraded with the GliGli CPU upgrade. Which makes the prophet 600 so much more of a synth. No more stepped filter sweeps, nice and snappy envelopes , etc!"

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Sequential Circuits Prophet 600 Analog Synthesizer w/ GliGli OS Upgrade SN 2447

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"The GliGli OS upgrade adds the following:
-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:
1. Fast Linear
2. Slow Linear
3. Fast Exponential
4. Slow Exponential
- A new LFO function generator with a wider range from one cycle every <20 data-blogger-escaped-seconds=""> 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:
1. Poly first note priority
2. Unison (all voice) Hi-key priority
3. Unison (all voice) Low-key priority
4. Solo (one voice) Hi-key priority
5. Solo (one voice) Low-key priority
-Mix Overdrive which now allows the output from both oscillators to drive the mix
VCAs A and B harder as well as the Curtis 4 pole filter resulting in new sonic
possibilities.
-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:
1. Amp and Filter velocity sensitivity with an external keyboard controller
2. Continuous Controllers (CC) of all sound parameters
3. 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
Included in the listing is the Sequential Circuits Prophet 600 as pictured."

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GLIGLI Teensy++ CPU SEQUENTIAL CIRCUITS PROPHET 600

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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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SCI Prophet 600++ (GliGli's firmware) Sound Demo

"Some sounds created with a modded Sequential circuits Prophet 600.
This p600 has the Gligli's teensy++ beta Firmware.

Chorus and reverb added, no eq no comp."

P600FW Examples


"This weekend I finally finished repairing some dead IC chips on my old Prophet 600 analog synth. I also installed an amazing new open-source AND open hardware CPU/firmware upgrade by a French developer who goes by name "Gligli." More info here: github.com/gligli/p600fw

Here are some examples of the extreme, glitchy, grungy sounds that are now possible to coax from from this once tame polysynth!"

Sequential Circuits Prophet-600 upgrade.