via this listing
Additional Perfect Circuit listings
Tuesday, October 21, 2025
Roland MKS-7 Super Quartet Sound Module SN 560939
Note: links to listings are affiliate links for which the site may be compensated.
via this listing
Additional Perfect Circuit listings
via this listing
Additional Perfect Circuit listings
Analogue Solutions Semblance: 4 Voice
via this Reverb listing
Additional NOISEBUG Listings
"SUPER RARE!
Pristine condition - Fully functional, Comes assembled to a 13U rack.
Semblance / 4Voice is a self contained TRUE analogue synthesiser. The voice circuitry is entirely analogue, using all discrete and op-amp components. There is no voice DSP happening! Semblance / 4Voice has a similar sound and specifi cation to the classic Oberheim SEM, but with many improvements such as MIDI, Noise, more modulation. Note however, Semblance is not intended to be and is not a clone of the SEM. If you want a true SEM sound, buy a SEM! The 4Voice version has a Poly mode, to allow four the voices to be used as one big 4-voice poly synth"
Unique Modded Yamaha CS30 Modded DUOPHONIC Midi Synth
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"This is a rare 1977 cs30. Yamaha’s most complex mono synth. The closest thing Yamaha made to a modular system. This one was modded specifically for me. Individual cv inputs for the 2 oscillators and individual gate inputs for all 3 egs. I have this hooked up to 2 Kenton Pro-Solo midi/cv converts. One is set to low note, one to high note. Now this synth plays like a classic duophonic synth like the Odyssey, sh7, etc through any midi keyboard or sequencer. Both midi converters and cables are included. It also has custom wood end pieces. I will also include the original plastic ones. This is a crazy synth with 2 oscillators, sub osc, 3 egs, 1 lfo, ring mod, cross mod, 2 multi mode filters, 2 amps, 8 step sequencer that can trigger any of the egs so you can make complex lfo shapes and modulate anything. Tons of modulation options everywhere. Even the external input can be a mod source and the lfo can be different shapes at different destinations and be effected by an eg. Amazing synth. Everything works perfectly. It should be noted that when using the cv/midi, some functions like detuning and portamento do not work. But the Kentons can do both and even add tuning range and extra LFOs."
via this Reverb listing
"This is a rare 1977 cs30. Yamaha’s most complex mono synth. The closest thing Yamaha made to a modular system. This one was modded specifically for me. Individual cv inputs for the 2 oscillators and individual gate inputs for all 3 egs. I have this hooked up to 2 Kenton Pro-Solo midi/cv converts. One is set to low note, one to high note. Now this synth plays like a classic duophonic synth like the Odyssey, sh7, etc through any midi keyboard or sequencer. Both midi converters and cables are included. It also has custom wood end pieces. I will also include the original plastic ones. This is a crazy synth with 2 oscillators, sub osc, 3 egs, 1 lfo, ring mod, cross mod, 2 multi mode filters, 2 amps, 8 step sequencer that can trigger any of the egs so you can make complex lfo shapes and modulate anything. Tons of modulation options everywhere. Even the external input can be a mod source and the lfo can be different shapes at different destinations and be effected by an eg. Amazing synth. Everything works perfectly. It should be noted that when using the cv/midi, some functions like detuning and portamento do not work. But the Kentons can do both and even add tuning range and extra LFOs."
Maestro Rhythm King MK1 SN M-10402 w/ Operation Instructions Model MRK-1
Note: links to listings are affiliate links for which the site may be compensated.
via this Reverb listing
"It's not everyday you're in the presence of royalty but get yourself a Maestro Rhythm King (like this one here, of course) and you will be! The Maestro Rhythm King is a legend and this Mark I version is even harder to find these days. Sly from Sly and the Family Stone used a Rhythm King, so did Shuggie Otis as well as many others and now it's your chance.
Fat, musical, Analog goodness await you with this oft-recorded vintage beat machine. Use the manual keys to add unique flavor to the already flavorful preset rhythms and you can even combine any two or three preset rhythms for even more variations. This thing looks amazing, sounds even better, will inspire your creativity, add Analog sweetness to your tracks or live performances and if you ever get tired of having it around (you probably never will) just sample the sounds on to your DAW and sell it for what you paid for it or more. That's the beauty of great vintage gear!"
via this Reverb listing
"It's not everyday you're in the presence of royalty but get yourself a Maestro Rhythm King (like this one here, of course) and you will be! The Maestro Rhythm King is a legend and this Mark I version is even harder to find these days. Sly from Sly and the Family Stone used a Rhythm King, so did Shuggie Otis as well as many others and now it's your chance.
Fat, musical, Analog goodness await you with this oft-recorded vintage beat machine. Use the manual keys to add unique flavor to the already flavorful preset rhythms and you can even combine any two or three preset rhythms for even more variations. This thing looks amazing, sounds even better, will inspire your creativity, add Analog sweetness to your tracks or live performances and if you ever get tired of having it around (you probably never will) just sample the sounds on to your DAW and sell it for what you paid for it or more. That's the beauty of great vintage gear!"
Expert Sleepers disting NT Envelope, Compressor, Arpeggiator & Poly Macro Oscillator 2
video uploads by Expert Sleepers
Playlist:
1. disting NT - Envelope (DAHDSR)
2. disting NT - Compressor
3. disting NT - Arpeggiator
4. disting NT - Poly Macro Oscillator 2 (Polyphonic Plaits)
Nibbler Noise Fest - Schlappy Patching 2025 EP.15
video upload by SCHLAPPI ENGINEERING and Stazma
"Hey there!
Today I'll show you how to use the Nibbler asa weird digital noise source and explore some patching using this same noise (scratch, percussions and more).
Have fun!!"
A Modern Classic Eurorack LPG New & Improved in STEREO!! // Stereo State Gate Stereo Field from SSF
video upload by DivKid
"Here we have the new 'stereo field' version of the Steady State Gate from SSF (Steady State Fate). It's a revamped circuit design with added features and new stereo functions that builds on what I think is a bit of a modern classic, the Steady State Gate from 2022. It's a re imagining and expanded LPG or low pass gate that has on board wave shaping, versatile filtering options and stereo field (stereo image, creation, control and modulation thereof) controls. It's beautifully musical and dynamic, check out the patches below."
"The Steady State Gate Stereo Field (SSGSF) is a stereo low-pass gate module combining dynamic filtering, timbre shaping, and stereo field control to produce rich, evolving textures with spatial effects. Suitable for both stereo and mono sources, it offers extensive modulation possibilities for expressive sound design.
Newly designed signal path with updated Timbre and Qaos response and control.
True stereo design utilizing a curated mid-side signal chain that provides processing features for stereo, as well as mono input signals.
Stereo and mono signal processing including psychoacoustic panning and stereo field enhancement with voltage control and two 'FIELD" modes.
New CV/GATE LPG control input. Can be used simultaneously with EXCITE for more dynamic and rhythmic effects."
Check with dealers on the right for availability.
Predator- 3 2025 October Update
video upload by Rob Papen
"The new presets inside Predator-3 version 1.0.5 or higher.
This update includes: Albino-3 Filter types, PlayMode lock, and more GUI sizes being 100,120,130,150 and 200%."
Error Instruments Introduces Error Mixer Eurorack Module
video upload by errorinstruments paul tas
"Something New and Special — the Error Mixer
Meet the Feedback Mixer — a five-input mixer with a twist.
At first glance, it works like a regular compact mixer. But hidden inside is a wild feature: an extra output with extremely high gain.
Feed this output back into the mixer and things start to get beautifully chaotic — intense distortion, bit-crushed textures, and raw, unpredictable feedback tones.
When pushed, it can even self-oscillate with no input, creating wild, evolving soundscapes on its own.
The magic happens when you blend this feedback madness with other sounds — it can add grit, energy, and edge to anything, especially drums or Acid-style basslines.
• 6HP wide – small but powerful
• Extreme gain for raw feedback experiments
• Perfect for distortion, noise, and texture creation
• Available assembled or as a DIY workshop kit
• Affordable and seriously fun
Get ready for crunch, chaos, and creativity — the Error Mixer is not your average mixer."
how to use the Polyend SYNTH
video upload by TOSKABYSS
"Today we are taking a look at a different way to approach the Polyend Synth. Embracing limitations and using it as a source of inspiration."
0:00 - Intro
0:37 - Overview
0:53 - The grid
1:48 - Synth Engines
2:35 - Important Sub Menus
3:09 - The design
3:36 - Accessing all the synth parameters
4:35 - A different way to approach the synth
4:55 - A typical approach
6:07 - First way I use Polyend Synth
8:14 - Second way I use Polyend Synth
9:44 - My only complaint
10:13 - Final thoughts
11:04 - Final track
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MATRIXSYNTH - EVERYTHING SYNTH
© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
