RING SM Sounds - A Ring Modulator/Sub-bass Generator & CP-3 Mixer for #eurorack

video upload by AJH Synth Official

"Playing around with the RING SM from AJH Synth. This is a hugely useful module, combining a 3-way all-analogue Ring Modulator, a -1 and -2 octave sub-bass generator, and 5-channel Moog CP-3 based mixer.
This is a real ring mod, as opposed to the more common, simpler and cheaper circuits found in many synths, such as the Odyssey, which often used CMOS chips to mimic the same behaviour. The authentic vintage circuit recreated in the RING SM is based on the Ring Mod of the EMS Synthi/VCS3, and has a hugely thick, rich tone.
The Sub Bass generator derives shaped square waves at 1 or 2 octaves below the pitch on an incoming VCO. This shaped squares are slightly curved at the edges, almost a cross between a square and a sine wave, which produces a much better balance of harmonic content and warmth/fatness than the common, purely square or sine sub basses found on most synths and modules, resulting in thicker yet more musical sub-octaves. Additionally, the 'Double' feature can generate an octave above the incoming triangle or sine wave.
The CP-3 mixers saturates as you'd expect from this classic vintage design, with soft clipping, and a boosted gain level on input channel 5."

Acidlab Bassline 3 Analog Bass Synthesizer

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

via this listing

Additional Perfect Circuit listings

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Korg multi/poly: Cosmic Circuit - Part 01

video upload by App Sound (by Matt Sour)

"Korg multi/poly: Cosmic Circuit - Walk through: Performance 01-32
A sound library by Christian Gritzner & Matthias Sauer.
Purchase: app-sound.com

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Tangible Waves - Discombobulator System

video upload by NOISEBUG

Inquire at https://www.noisebug.net/. Pics and details on the system follow.

"The Discombobulator - a Noisebug-designed Tangible Waves system in the AE Modular format, a great entry to the format and an even better addition to an existing AE Modular rig.

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Blue Monday/New Order (Circuit Tracks Revision)

video upload by Guinan

"Almost! It's another Monday, so what could be more apt than todays 1983 New Order classic, Blue Monday.

As per usual this is ALL Novation Circuit Tracks playing live from the audio outs direct into my Zoom L6 recorder. No extra synths/no effects/no extra edits.

This is a revision of a version I did about 12 months ago. There is a lot going on in this track so I've squeezed a bit extra out of the groovebox in using some short melodic samples in place of drum sounds on 3 pads.

I'd initially dug it out to get me started on an Ableton Move version of the track and with some polished up samples and a little bit of editing I thought it was worth a revision.

More details for synth nerds,

BPM 131
I originally programmed the top arpeggio line on the Circuit Tracks quickly realising I was going to run out of voices. I sampled the riff and stuck it on a pad and played it back as a pattern and saved myself a voice, I couldn't get a bass synth sound that would double up as the main synth and as 'Peter Hook'. Instead I played a short Spaghetti Western style bass guitar riff through a spring reverb in my best impression of Hooky and sampled it on the Circuit Rhythm. I then transferred this onto one of the drum sample pads and put it on Drum 4 as another pattern, finally there is a choir sample the band played on an old Emulator. I simply copied the same source they used ( Kraftwerk's track, 'Uranium') and made a loop on another one of the drum pads, turning it into a 3rd pattern for Drum 4."

Marcus Dunn aka lonesoulsurfer DIY Modules

video uploads by Marcus Dunn

Playlist:

1. 7 Channel Mixer For My Modular Synth.
2. Medusa - Sound Effects for Modular Synths
3. Buffered Multi for Modular Synths. Powered by Arduino
4. Digital Delay Module - Powered by Arduino
5. Bleep - Modular Drum Synth - powered by Arduino
6. Solar - A Modular Synth, Powered by Arduino
7. Groove Box Modular Synth - Arduino Nano
8. Freaq FM Synth. My Take on the Awesome MeeBleeps Synth
9. Mutant Generative Synth - Powered by Arduino

Additional details on each:

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Trance Foundations Two — Uplifting Trance Patches & Samples for Novation Circuit Tracks

video upload by Isotonik Studios

"Trance Foundations Two by Techtronix transforms your Novation Circuit Tracks into a complete uplifting trance production machine — 128 synth patches, 64 drum samples, and 16 ready-to-play sessions at 140 BPM.

→ Get Trance Foundations Two: https://isotonikstudios.com/product/t...

Designed to capture the emotional intensity and driving energy of both modern and classic euphoric trance, this pack delivers everything you need to craft festival-ready tracks directly on your groovebox — no DAW required.

The 128 synth patches cover every trance essential: 40 deep driving bass patches with that characteristic trance punch, 40 soaring lead patches built around epic supersaw stacks and emotionally charged melodic lines, 32 lush evolving pads for that signature wall of sound, plus 8 gated synths and 8 chord stabs for rhythmic movement and harmonic punch.

The 64 club-ready drum samples are purpose-built for trance production — punchy kicks, cymbals, crash and impact FX, and 24 bass stab samples organized in F minor across 3 rows, plus specialized trance vocal cuts and FX for authentic club energy. The 16 professionally sequenced demo sessions at 140 BPM round out the package, giving you instant inspiration and performance-ready templates from the moment you load the pack.

⚡ Triple Pack Savings: Add any 3 or more Techtronix products to your cart and save 20% automatically at checkout!

→ Explore the full Techtronix collection: https://isotonikstudios.com/brand/tec..."

Roland AIRA TB-3 Touch Bassline Bass Synthesizer

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

via this listing

Additional Perfect Circuit listings

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Milan Metro by Syd and I - 2026 Tiny Desk Submission

video upload by Syd and I

This one is in via supporting member Saul Stokes, the I in the father and dauther duo Syd and I.

"We are excited to share our song Milan Metro with you. This song was written while we were on vacation in beautiful Milan, Italy. We loved riding the old trains through the city.

Performed on a Circuit Tracks, 1010 Black Box, Korg Kaoss Pad NTS-3, Dexed Synth

Syd and I are Sydney and Saul Stokes, a father/daughter synth-based band from Oakland, CA. Saul has been writing electronic music for decades. After seeing his daughter Sydney perform at an open mic, they began writing music together. Syd and I have now been performing original songs around the Bay Area for over a year. They draw inspiration from pop and electronic music to create a sound that can span generations."

Yuyo cmos synth - First try Attiny85 dco with analog cmos shaping and twin t filter

video upload by JIANT

"everything is from the synth to the zoom recorder, twin t drums, xor snare, pt2399, and cmos stuff.

attiny85 reseting the phase of 40106 oscilators, the digital control accepts 1voct from keysetp and go to the 40106 inputs through resistors, a little rc for filtering the pwm, and for this reason when you change the oscillator frequency you can get intervals and crazy stuff. is not orthodox but suits my need for Rich timbres. the dco goes to 40106 buffers , and then 4040 dividers, twin t filters, one for each of the two voices, one goes to env, vca, filter, delay, and the other one to clock divider and filter, to get the sub osc.

firmware super simple only for checking the conversion from filtered frecuency of the attiny85 to my 40106 non exponencial vcos.
currently is tracking 10 octaves really good, the trick is put a voltage divider in the cv in of the attiny because keystep has 0 to 10v and the attiny accepts 0 to 5v tehn the tracking inside the attiny converts o.5v oct to 1 volt oct. i dont know anything about coding but i made it with chat gpt and my design . source code will be in the coments ."

Previous videos:

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Bizarre Love Triangle/New Order (Circuit Tracks & MiniDEXED version)

video upload by Guinan

"‘Bizarre Love Triangle’ from 1986 is first off the rank for my ‘New Order February’ recreations.

I love this perfect slice of dance-synth-pop and I was keen to get the DX7 bass intro as close as I could. Earlier this week I’ve been showing the tiny $75 Raspberry Pi synth, MiniDEXED, that I built to add this vital ingredient. If you are interested check out the video showing more details, • I made a synth for $75* ! (*excluding tar... [posted here]

A couple of very clever folk identified what I was cooking up!

The MiniDEXED was sequenced from the MIDI tracks on the Circuit Tracks and routed into the audio in to add effects from the Tracks. All that you hear was programmed into the single Circuit Tracks and no further additional synths or processing were done to the sound – it’s straight audio out recorded direct into a Zoom L6.

The arrangement was taken from several versions posted on Musescore and compressed into the 4 melodic tracks and rhythm. Thanks to everyone who posts their transcriptions there.

I hope you enjoy the track as much as I did making it. Stay tuned for more New Order recreations and reworkings for the rest of this month.

(Ableton Move version coming in just a couple of days...I'll post a link here when it's live).

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Stereo Triple Filter Network & Resonator // 3 Patches with OPALINA from Hieroglyphic

video upload by DivKid

"Coming in hot after Hieroglyphic's first release 'Plume' here we have OPALINA which is a stereo spectral playground. It's billed as a filter network, with triple band pass resonator modes and an isolator multi mode network. It has multi band outputs for creative modular processing, with the including expander it also has specific (and stereo) low mid and high band inputs. Loads to go at, but distilled down into exploring 3 patches here for our 3 PATCHES series of videos."

*TIMING INDEX // CHAPTERS*

The broader, patch by patch sections are in ALL CAPS and sub sections that might be useful to skip to are all lower case.

INTRO
00:00 Hello & previews
00:57 What is Opalina & what are we doing?
01:33 Feature run down
04:00 PATCH 1 // RAW SOUNDS & OSCILLATOR SHAPING
04.22 The raw sound of the resonator & isolator modes
05.49 Building a VCO shaping patch
07.24 Patching FX sends from specific frequency bands
08.25 Series channel patching for steeper filter slopes & more resonance
09.41 v/oct tracking

BONUS HYPNOPTIC MULTIBAND FILTER PINGS
11:40 / divkid for the full patch run down

PATCH 2 // SPECTRAL MIXING
12:45 Creative spectral mixing for multiple FX modules
15.15 Creating a multi band spectral mix
16.24 Modulating a spectral mix
17.32 Audio rate modulation
18:51 Spectral drum FX
20:43 Spectral Rings FX
22:51 PATCH 3 // MULTIBAND MODULAR PROCESSING

Also see:
This is KILLER! // Plume updates from hieroglyphic (new cluster mode & sound engine)
The fascinating world of PULSAR SYNTHESIS with Plume from hieroglyphic

via Hieroglyphic

Stereo state-variable filter networks configurable in two modes. RESONATOR is a triple bandpass alignment, emphasizing resonant peaks and formants. ISOLATOR is a cascaded state-variable topology with variable mid-bandwidth for use as resonant crossover.

· RESONATOR: triple bandpass filters with vc peak span and resonance. 12db/oct filter slopes.

· ISOLATOR: cascaded state-variable filters with vc bandwidth and resonance. 24db/oct filter slopes.

· Completely analog signal path.

· Individual band inputs and outputs.

· Continuously variable band input amplitude.

· Soft-clipping circuit on SUM output.

· Dual channel for use in stereo (L & R).

Torso Live Session #3: Lorenzo Colombo

video upload by torso electronics

"Torso Electronics presents the third live session recorded at our office space in Copenhagen.

In this episode, percussionist and sound artist Lorenzo Colombo presents an electroacoustic concert featuring the T1 and S4 in a hybrid setup combining metal percussion instruments and solenoids.

The performance is driven by the T1, used as both sequencer and live MIDI keyboard. It controls the SOMA Pulsar-23 and a set of dadamachines solenoids. The solenoids hit a set of Kolberg percussion bell plates, which function simultaneously as acoustic instruments and conductive metallic surfaces. Through body-resistance and circuit-bending interactions, these plates influence electrical signals and directly modulate the Pulsar-23 as well as generates MIDI that control the same instrument . All audio is routed into the S4, used as the sole sound-shaping and modulation unit.

About Lorenzo Colombo
Lorenzo Colombo is a Copenhagen-based percussionist, performer, and sound artist dedicated to contemporary and experimental music. He teaches percussion and post-instrumental performance at the Royal Danish Academy of Music, where he earned his Soloist Diploma in 2023. A recipient of the Léonie Sonning Talent Prize and Musikanmelderringens Kunstnerpriser, Lorenzo was also part of Statens Kunstfond’s Den Unge Kunstneriske Elite program (2023–24)."

Studio Electronics MidiMini 3 OSC MonoSynth SN 1304

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

via this eBay listing

"The Midimini was Studio Electronics' first series of synthesizers built from scratch. Prior to the Midimini was the Midimoog, which consisted of actual Minimoog circuit boards retrofitted into a rackmount enclosure. The Midimini does not use the original Moog circuit boards, but instead Studio Electronics designed their own boards. Minimoog users will find the layout to be quite familiar with some nice additions such as a dedicated modulation LFO, oscillator sync and switches for aftertouch control. This unit is in very good condition with a bit of rack rash on the top and bottom. If you are looking for that classic MiniMoog tone, wicked huge basses and leads.. This box delivers!"

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Small Town Boy/Bronski Beat (Circuit Tracks version)

video upload by Guinan

"Feeling a bit of 80’s nostalgia ('Stranger Things' anyone?) I thought the time had finally come to try and give this classic electro-pop anthem the Circuit Tracks treatment. Released in 1984 (40+ years!) it’s too easy to forget how ground-breaking the song (and it’s subject) was in the political climate of the Eighties.

The song itself is a simple but almost perfect pop song. It was programmed on an MC-202 Microcomposer and is reputed to have started life as an electronic disco version of the Sex Pistol’s 'Pretty Vacant'!

Yamaha DX7 is used heavily on the track (notably the presets ‘Harp1’ and ‘Bass1’), and additional Sequential Pro-One, Memorymoog and Linn drums. I managed to simplify the arrangement to program everything and the vocals into a single Novation Circuit Tracks. Everything you hear is being played and recorded live from the Tracks.

I'm pleased at how close to the spirit of the original I managed to get this time. I hope you enjoy the track and it brings back some memories for you too."

"More details for synth nerds
BPM 135
I don’t own a DX7 (sadly!) but the closest thing I have is emulation. The repeated ‘Harp1’ DX7 line (and the ‘Marimba’ break) was sequenced on the Tracks MIDI 1 and sampled as 4-bar loops from the internal MicroDEXED emulator in an M-Vave SMK-37 Pro keyboard. Each sample was then triggered (like a drum sound) at the required point in the song using the Drum 3 track.

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Behold the CRUMAR CORDATRON (1974)

video upload by Vintage Audio Institute Italia

"Chapters
..................
00:00 Introduction
00:49 Organ Section with Vibrato controls
01:47 String Machine Section
02:16 Brass Section w Filter Controls
02:47 Musical Interlude
04:51 Left Hand Chords
05:57 Left and Right hand
07:12 Musical Interlude 2
08:31 Outro

CRUMAR CORDATRON (1974) Castelfidardo

This is an accordion string machine with organ section, a brass synth section with filter controls, trigger-able analog drum sounds and chord and piano presets on a Stradella button board.
Crumar made a few different models of this type of instrument but this is the very first.
Unicorn rarity is the order of the day regarding the control key- and button board - the serial number 3 of allegedly 10 units ever put in production.

Crumar had just started producing keyboards after mainly producing accordions, and around this time they launched the three COMPAC models that definitely inspired the sections of the Cordatron: Compac Strings, Compac Brass and Compac Piano.

Most of the CRUMAR CORDATRON specifications are in the video as text already so please watch the video and read the text - but a quick roundup would look like this :

The instrument consists of mainly two separate units connected by a huge, hardwired 3-piece connector : the main sound generator unit with power supply, audio outputs, tuning and volume pedal, as well as the control unit - basically a butterflied accordion with a Stradella button board for the left hand and a regular keyboard for the right hand.

All the sounds are analog and are generated by the very first generation of divide down technology - no eproms or other intruders of vulgar modernity is on hand.
The sound generator weighs 23 kilos and is literally crammed with sandwiched layers of massive circuit boards of transistors and capacitors.

If you're into rare Italian synths and drum machines you can subscribe to our channel and please check out our other videos of rare gems, but you might also enjoy the V.A.I. website : a photo book and encyclopedia Italian Vintage Synths and Drum Machines: https://www.vintageaudioinstitute.com/"

KORG MS-03 SIGNAL PROCESSOR MS-Series w/ Original Box SN 181437

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

via this Reverb listing

"Features and Specifications:

Input: 1/4" Input

Input Sensitivity: 3 volts peak-to-peak maximum

Portamento: Minimum to maximum travel time

Output: CV Out Hertz/Volt Analog Pitch Control (0 ~ +8V)

Output: CV Out Octave/Volt Analog Pitch Control (+1 ~ +5V)

Output: Trigger High to Ground

Output: Trigger Ground to High (+15v)

Modes: 3 Levels of Tracking Response

Range: High and Low range of operation

Output: Envelope Control Voltage

Dimensions: 283 mm (W) x 195 mm (D) x 110 mm (H)

Weight: 2.4 kg, 4W


In the late nineteen seventies, Korg was apparently determined to open the world of synthesizers to more than just keyboard players.

Introduced in 1979 just a year after the classic MS-10 and MS-20 the MS-03 converts incoming audio signals into a range of control voltage signals. The MS-03 can drive just about any monophonic analog synthesizer, with outputs that support both the Moog/Arp/Eurorack standard of one volt per octave, and the less common Korg/Yamaha standard of hertz to volts. The unit also has two different types of gate outputs.

For users of the Moog/Arp/Eurorack standard there is a tuning and width control. The tune control is used to "tune" the MS-20 to the attached synth, and the "width" control adjust the precise range of one octave.

Korg MS-20: The circuitry of the MS-03 is similar to the Pitch to Voltage circuit in the Korg MS-20, but a comparison of the two converters shows the MS-03 is faster and more accurate than the MS-20.

Korg MS-03: The MS-03 has many of the same controls as found on the Korg X911 Guitar Synthesizer without the synthesizer components. Features found on both units include footswitch-operated Portamento, Synthesizer "Hold" and "Cancel" functions.

[Condition]

This MS-03 is in perfect working condition and in Very Good condition.
This unit was checked by professional technician.

with box and foot pedal, paper work(copy)"

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FARFISA POLYCHROME (1979)

video upload by Vintage Audio Institute Italia

"Chapters
..................
00:00 Musical Interlude 1
01:29 description
02:08 Vocal Chorus (Chor) section
04:00 Strings section
04:45 Musical Interlude 2
05:11 Ensemble (polyphonic Synth / Brass) section
05:51 Modulation (chorus)
06:12 Phaser
07:40 Musical Interlude 3
08:40 General Controls (double octave, white noise and after touch)
10:48 Percussive (Piano) section
12:15 Muscial Interlude 4

FARFISA POLYCHROME - 1979
A gigantic instrument with an equally huge sound - was this the ultimate string machine of the era? With 4 independent sections of Divide Down-based instruments with lots of modulation capabilities - our bets are in. The Polychrome uses octave-divider technology to achieve full polyphony meaning you can effectively play a 61 note chord.

It's a big-boned piece of gear, wide and surprisingly deep - it shares the same measurements as the ELKA SYNTHEX but adds a couple of kilos of weight - this to comfortably fit all the circuit boards inside.

We have an additional unit available for purchase - in excellent condition with the original carrying bag included - if you're interested please don't hesitate to contact us for more info, price and photos.

Most of the Farfisa Polychrome specifications are in the video as text already but a quick spec sheet would look like this :

There are four main instrument groups with individual preset sounds that are selectable one at a time

1. Percussive - 6 presets in. all (Piano, Harpsichord, Clavichord and the latest in modern piano emulation - Honky Tonk). This section is equipped with a dedicated filter with Brilliance, Decay and Emphasis parameters, effectively it doubles as a polyphonic synthesizer section.

2. Strings - 1 single preset with 3 octaves selectable simultaneously to form a massively huge string section.

3. Ensemble - 3 Brass preset sounds with an expanded filter section of brilliance and emphasis filter as well as attack and decay controls. There's an error in the video text here : all presets are 'free' - meaning you can adjust the parameters of all sounds. You can get a wide variety of sounds here, from synth leads to basses, brassy chords, you name it.

4. Vocal Chorus - Now this is special : 3 haunting choir preset sounds with an additional free mode, with access to Resonance and Cutoff parameters."

A new Minimoog VST controller: SFC-mini V4 Intro

video upload by mylarmelodies

"The SoundForce SFC-mini V4 is a new dedicated physical hardware controller for Minimoog-style VST plugins. This video introduces the device and how it works, what's new in this model, the special bonus features that work with the Arturia Mini V4 plugin, and much more.

This video serves as an official intro to the SFC-mini V4, and was funded by SoundForce. Based in the Netherlands, SoundForce have been in business for more than 10 years making controllers and eurorack modules."

CHAPTERS:
00:00 - Why Does this Exist?
02:23 - Minimoog: From Bass to Pad
04:39 - Whats new in V4?
06:59 - Build and Feel
07:25 - How does the integration work in a DAW
08:02 - Mini V4 Smoothing Catchup
08:55 - Mini V4 Jump & Pick-up Catchup Modes
09:43 - Hopping between plugin instances
10:28 - How do you set up a Plugin?
10:52 - UA Minimoog
11:34 - Dump (Manual Control)
11:56 - UA Minimoog Play
14:01 - Extra Control at the Bottom
14:54 - Changing Presets (Mini V4)
15:46 - User 1 & 2 Mapping
16:41 - Mapping Another Plugin (MS-20)

Press release follows:


SoundForce is introducing the SFC-Mini V4, a high-end, dedicated MIDI controller designed for the world’s leading Minimoog software emulations. Featuring more than 65 hands-on controls arranged in an authentic Minimoog-style layout, it delivers a true analog-inspired workflow for modern producers. Representing over a decade of SoundForce MIDI-controller innovation, the SFC-Mini V4 is the most advanced and accurate Minimoog-focused controller yet.

Build quality
The SFC-Mini V4 is assembled in the Netherlands using high-quality components sourced from Europe and Asia. Its case is built entirely from powder-coated sheet metal. Both sides are fitted with elegant 8 mm walnut wood panels for a vintage-inspired look.

Backed by over ten years of MIDI-hardware expertise, the SFC-Mini V4 is part of SoundForce’s newest generation of controllers. Its pots, sliders, and switches were chosen after extensive research and experimentation to deliver outstanding tactile response, long-lasting performance, and rock-solid reliability during assembly.

Plugin support:
Because the SFC-Mini V4 outputs standard MIDI CC messages, it can be paired with any software or hardware that supports MIDI CC mapping. However, since each plugin has its own UI and MIDI implementation, the firmware provides dedicated plugin modes to ensure proper integration. The SFC-Mini V4 has specific plugin modes supporting the following plugins:

Arturia Mini V4 (incl 2-way)
Arturia Mini V3/iMini
GForce Minimonsta 2
Cherry Audio Miniverse
UA Minimoog
Softube Model 72
NI Monark
Synpase Audio The Legend HZ
Plugiator Minimax

2-way communication:
Two-way communication means the SoundForce controller and a supported plugin can talk to each other in both directions, instead of the controller only sending MIDI data one-way. At this point, this feature is supported with the Arturia Mini V4.

In practice, that creates a far more “hardware-like” experience when using software synths. Change a preset, load a new instance on another track, move a parameter with your mouse and the controller automatically syncs its LED switches, and ingest the pot data in memory. When the received pot data from the plugin differs from the actual pot position on the controller, 3 options similar to Ableton take over modes can be chosen from: jump, pick-up and smoothing.

For more technical details: consult the manual.

Where to buy:

EU: SoundForce store

UK: Signal Sounds

US Perfect Circuit

nonlinearcircuits Introduces 4HP NEURON

video upload by cirtcele

"This module is a 4HP version of the NLC 8HP Neuron & Difference Rectifier.

The differences are half the panel real estate, SMD components, LEDs to indicate activity and one less input on the Neuron (2 instead of 3).

From the original version description -

The Neuron was inspired by a paper on neural computing and is a variation of a typical analogue neuron circuit. It can be used as a complex audio waveshaper, gate or pulse generator, CV shaper or to generally mess things up. The diff-rect is a hybrid of two basic op amp ‘building blocks’ – a difference circuit and a rectifier. Not sure if I have ever seen the two merged together before. It is probably a bad idea except for synth use, where it is a wonderful idea!

The Difference Rectifier has 4 inputs (two + & two -) and two outputs. The Neuron has 3 2 inputs and one output, the pots control when the neuron will react to incoming signals and how much it will react."