SCI Prophet 600

Title link takes you to shots pulled via this auction. Note the new wood side panels from SYNTHWOOD.COM. Note the "Fluent MIDI Spoken Here" in the other shots. The Prophet 600 was the first synth with MIDI. An interesting bit of trivia on this particular unit, is according to Stephen, the seller, this was John Bowen's Prophet 600. The first synth with MIDI owned by one of the people at Sequential when it came out.

Prophet 600 Sequential Circuits Synthesizer SN 2093

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" Sequential Circuits Prophet 600 Synth in great condition. The Sequential Circuits Prophet 600 analog synthesizer is a 6-voice polyphonic synth that offers rich two-oscillator-per-voice analog sound and extensive modulation options. It was also the first synth that supported MIDI.

Features:

* 6 voice polyphony, with two oscillators/voice
* Oscillators – VCO A saw / pulse / triangle; VCO B saw / pulse / triangle / PW
* LFO – pulse / triangle
* Curtis analog filter, with cutoff, res, env, kybd modulation
* VCA – ADSR
* 61 key keyboard
* Lots of knobs for immediate control
* 2-track, real-time sequencer
* Arpeggiator: up, down, up/down"

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Sequential Circuits Prophet 600 Analog Synthesizer with Gligli SN 4636

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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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Sequential Circuits Prophet-600 MIDI Analog Synthesiser

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"The Prophet 600 is a MIDI six voice polyphonic analog synth. Featuring two Curtis Electromusic CEM3340 oscillators per voice and the CEM3372 VCA/24dB/Oct low pass filter, sequencer and handy arpeggiator. The 600 gives you access to many of the classic Prophet style sounds without the crazy price tag that the Prophet 5 seems to attract"

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 Circuits Prophet 600 with Gligli Mod SN 2226

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"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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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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Sequential Circuits Prophet 600 Analog Synth with Teensy Upgrade

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"This Prophet 600 is in super condition and has recently had a $600 full service performed by the excellent technicians at Switched On, Austin TX. Sounds amazing, plus it has the TEENSY Modification done."

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Sequential Circuits Prophet 600 Polyphonic Vintage Synthesizer SN 2148

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"For sale a vintage Sequential Circuits Prophet 600 synthesizer. In perfect working condition! Cosmetically it's in near mint condition (see photo's). It's a 110V version and the serial number is: 600-2148 ."

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Sequential Circuits Prophet-600 Brochure

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"Sequential Circuits Pro-600 Brochure from 1982

This original vintage Sequential Circuits Brochure contains information and picture’s of the the Sequential Circuits Prophet-600 synthesizer."

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Sequential Circuits Prophet 600

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"Sequential Circuits Prophet 600 in excellent condition and in perfect working order. The celebrated little brother of the Prophet 5 and the first commercially available synth to feature MIDI functionality, the P600 model is an incredible value, retaining the rich tonal quality and much of the functionality of the Prophet 5.

The P600 has two oscillators per voice with sawtooth, triangle, and variable pulse waveforms. The oscillators can be individually tuned or synced together. Similar quality VCF and VCA sections from the Prophet 5 can be found here too! The P5's Poly-Mod section has also been passed onto the P600. An extremely versatile and easy to use synth, highlights of the P600 include the onboard arpeggiator, two-track sequencer and poly-modulation. The P600 is great for creating analog effects, swells and drones, and additionally boasts a glide effect and very flexible modulation possibilities.

The synth has been freshly serviced and thoroughly tested, and all functions and features work as intended. There's only very light wear on the solid wood ends framing the synth, and only a bit of additional light edge wear on the enclosure. All of the original knobs are intact too."

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Sequential Circuits Prophet 600 SN 0228 J with Gligli Upgrade

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via this auction

"Up for sale is our superb Sequential Circuits Prophet 600 analogue polysynth installed with the essential GliGli upgrade. This upgrade transforms the P600 into the great synth it always promised to be with superb filter and envelope response plus many additional features and improvements.

Featuring 12 analogue oscillators (2 per voice), analogue filter, poly mod section (also seen on the prophet 5), six voice unison, chord hold and arpeggiator. Packed full of the same classic CEM hardware that features in the Pro One and Prophet 5, this synth has a big, powerful and flexible sound."

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Sequential Circuits Prophet 600 with Original Case

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via this auction

"Up for sale is our superb Sequential Circuits Prophet 600 analogue polysynth installed with the essential GliGli upgrade. This upgrade transforms the P600 into the great synth it always promised to be with superb filter and envelope response plus many additional features and improvements.

Featuring 12 analogue oscillators (2 per voice), analogue filter, poly mod section (also seen on the prophet 5), six voice unison, chord hold and arpeggiator. Packed full of the same classic CEM hardware that features in the Pro One and Prophet 5, this synth has a big, powerful and flexible sound."

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Sequential Circuits Prophet 600 with Gigli Upgrade

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via this auction

"Up for sale is our superb Sequential Circuits Prophet 600 analogue polysynth installed with the essential GliGli upgrade. This upgrade transforms the P600 into the great synth it always promised to be with superb filter and envelope response plus many additional features and improvements.

Featuring 12 analogue oscillators (2 per voice), analogue filter, poly mod section (also seen on the prophet 5), six voice unison, chord hold and arpeggiator. Packed full of the same classic CEM hardware that features in the Pro One and Prophet 5, this synth has a big, powerful and flexible sound."

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Sequential Circuits Prophet 600 SN 4532

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"The successor to the venerable Sequential Circuits Prophet V - the lighter, leaner, preset-weilding, MIDI capable Prophet 600! Seen here in clean, original condition and just back from a fresh servicing.

All keys works perfectly alone with all the pots, switches, wheels, and jacks. The only detectable "issue" on this bad boy is the no. [4] button on the membrane needs to be pressed harder than the others. The rest of the membrane works fantastically well. New membranes are available and cost about $80. Aside from a little superficial cosmetic corrosion on the casing screws and MIDI plug rims, it's ready to go!"

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LIKE *NEW* Vintage SEQUENTIAL Prophet 600 w/ TEENSY CPU + Original Case SN 0352J

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"Unless you have means to go back and buy one brand new in 1982 you will have trouble finding one the same! It could easliy pass as new old stock.Take a look at the pictures!

Comes with it's original ultra rare, fitted Sequential flightcase, original footswitch, original patch cassette, an operation manual, the GliGli Upgrade manual and power lead! Also comes loaded up with all the original factory presets for you to get going!

Further to that this already great sounding twin VCO analogue synthesizer benefits from having the incredible GliGli/Teensy 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), full MIDI control..plus a whole host of new features and sonic possiblities!

Comes fully serviced and operationally perfect, no bad buttons or scratchy pots etc. Pots are all nice and tight and smooth..in keeping with a synth that has had very little use! So all ready to go!"

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

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via this auction

"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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Sequential Circuits Prophet 600 SN 3409

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via this auction

"The first commercially available synth to implement MIDI!! It's a fun synth. Its big brother is the legendary Prophet 5. The P600 is very affordable today and is a great buy. Models with the newest software will enjoy polyphonic MIDI implementation and up to 100 memory patches to store their own sounds! The sound of the Prophet 600 is brighter and harsher than that of a Juno 106 but still just as funky.

This unit has been used constantly and because of that it exhibits some wear. As you see in the photos one of the wood panels is chipped. Other than that the keyboard works as it's supposed to."

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SEQUENTIAL CIRCUITS PROPHET 600 ANALOG POLYPHONIC SYNTHESIZER w/ Gligli Upgrade

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"Everything works fine. Pad keys works without any problem.
No crackle whatsoever in any knob.

Gligli modification installed.
This takes Prophet 600 as close as possible to a Prophet 5
(A known reason why the prices getting higher and higher everyday)"

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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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