20cc Spectron: Classic Tape Dual Oscillator | Knobcon 2026

video upload by CatSynth TV

"Andrew from 20CC takes us on a tour of the TXX-1 Spectron, a dual-voice module based on samples from classic recording-based instruments like the Mellotron and Optigan.

To find out more, please visit https://www.20cc.cool/

'The 20CC TXX-1 Spectron is a Eurorack format dual oscillator inspired by vintage analog multisampling instruments such as the Mellotron, Chamberlin, and Optigan. Spectron uses a unique combination of synthesis and sampling techniques to bring the rich, warbly sounds of these classic instruments into Eurorack for the first time, while also offering new possibilities to manipulate, warp, and mangle them.'" Patreon: / catsynth | https://shop.catsynth.com | https://ko-fi.com/catsynth


0:00 Introduction
0:15 Spectron
1:49 Availability
2:08 How sounds are added to Spectron

"The 20CC TXX-1 Spectron is a Eurorack format dual oscillator inspired by vintage analog multisampling instruments such as the Mellotron, Chamberlin, and Optigan. Spectron uses a unique combination of synthesis and sampling techniques to bring the rich, warbly sounds of these classic instruments into Eurorack for the first time, while also offering new possibilities to manipulate, warp, and mangle them.

Analog multisampled instruments had their hey-day in the 1950's through the 1970's. They used analog recording technology - tape recording in the case of the Mellotron and Chamberlin, and optical sound printing on analog photographic film in the case of the Optigan. Each key corresponded to a recording of a note played on another instrument, often orchestral sounds like strings, woodwinds or choirs, which would play back when the key was pressed. All of Spectron’s sounds are based around full, per-key recordings of vintage multisampled instruments.

Rather than simply triggering discrete samples, Spectron organizes many samples to create the illusion of a continuous voltage-controlled oscillator. As pitch changes, playback seamlessly transitions between recordings, preserving the character of each original tape while allowing smooth, continuous frequency control.

There are two assignable timbre shaping sections not normally found on sample-based instruments: FM and Sync. These are tuned to range from subtle modulations that recontextualize familiar sounds, through radical transformations that are barely recognizable, and all the way to harsh and clangorous, with continuous CV control of all points between."

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New Michigan Synthwerks MSW-820S In the Works

The MSW-820 with built-in sequencer section.

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Ableton MIDI Note Mapper

video upload by Akihiko Matsumoto

"A drum pattern should not lose its musical identity simply because the receiving instrument uses a different MIDI note layout. A kick should remain a kick, a snare should remain a snare, and a closed hi hat should remain a closed hi hat.
https://akihikomatsumoto.sellfy.store...

MIDINoteMapper 2.0 is a Max for Live MIDI Effect that translates drum notes by musical role instead of applying a simple pitch shift. Select the source map and destination map, then move the same rhythm between different drum machines and Drum Racks without rewriting the MIDI clip note by note."

AE Machine | Architecture For Drums That Never Repeat & Oxide Virtual Tape Processor

video upload by Emiliano

"One practical note: listen to this on monitors or proper headphones. Most of what the machine does lives in the low end and in the stereo field, and laptop speakers will simply delete it. Loud is not necessary, full range is."

This one was spotted and sent in via Ivan Trajkovic aka deejayiwan. There are 21 videos in the playlist above. They mainly focus on AE Machine as a whole, but video 7 is focused on Oxide. You'll find the full video descriptions for the first and seventh videos further below. You can find full details on AE Machine at https://www.peamarte.it/ae - Oxide in chapter 52 of the user manual.

In short, AE Machine (estimated release date of October 2) consists of:

"Eleven synthesis voices built from scratch at sample level, five samplers, two free-running pads. A sequencer where a 16 × 16 Markov matrix decides which step may follow which, a note sieve that re-orchestrates the pattern when you transpose it, a chaotic modulation matrix reaching 271 parameters, morphing between any two presets, and a stem recorder that writes twenty-six files in one press. It runs in Max/MSP 9 on macOS and Windows, and playing it requires no paid Max license: an unlicensed copy of Max opens and runs the machine in full.

This is not commercial software in the ordinary sense. It is my working method, the environment I built night after night for my own music, packaged so that you can play it. When you get it, you are getting research: the reading, the listening, the failed versions, the decisions. The manual is a hundred pages and it is already here, whole, free to read. Trust your ears over any paragraph in it."

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Collapsing Pulsar & Limnetic Synth - Virtual HTML Synths by Limnetic Villains.

video upload by Limnetic Villains

"Very early preview of my new experimental HTML synth.

If you want to support the project and have your name added into the synth as a supporter, support the project via Kofi!

https://ko-fi.com/limnetic"

Playlist:
1. Collapsing Pulsar Early Preview
2. COLLAPSING PULSAR Short Preview
3. COLLAPSING PULSAR KEYS/SEQUENCER DEMO
4. 10 minutes hands on with the new Collapsing Pulsar synth


video upload by Limnetic Villains

"Just a very quick first look of the port of my HTML Limnetic Synth to Mac, it's early days, porting both my Villains drum synth and this over. So far so good, sounds great, looks pretty cool, now it's just about honing it and giving it extra features!"

Playlist:
1. Limnetic Synth V1 Mac Demo
2. Limnetic Synth V1 Mac Demo2
3. Limnetic Synth Mac Version Demo 1
4. Limnetic Synth Mac Version Quick Demo 3 Automation And Arps

TableMorph - Experimental Wavetable Synth (Reaktor)

video upload by Cycles & Spots

00:00 Presets
22:27 Walkthrough

"Cycles & Spots created and experimental digital , bright sounding wavetable synthesizer, useful in many genres. It can sound harsh to soft, melodic to disharmonic & produces melodies to soundscapes. It's based on creating rhythm from loops and sound from 2 mixable oscillators each with its own sequencer and lots of modulation options. 127 loops for the rhythmic are included (Drag & Drop possible) and the synth comes with 50 presets.

Pack Details:

1 Instrument / Ensemble For Reaktor feat:
Synced Sample Player With 127 Loops
Envelope Follower (Amplitude)
2 Wavetable Oscillators
2 Sequencers
2 Saturators
Tremolo
Reverb

Available: https://www.deepdataloops.com/?post_t..."

Neutral Labs Scrooge firmware update v1.3

video upload by Neutral Labs

00:00 It begins...
00:08 Extended BPM range
00:54 MIDI pattern change
01:04 MIDI playable voices (also chromatically)
01:25 Drumkit mode

Reliq - Rlx 1.9.0: Build Your Own Hybrid Instrument

video upload by Reliq Instruments

"A single Reliq track can now play four Eurorack oscillators and an FM synth at the same time. Rlx 1.9 adds Custom Track Outputs: each of a track's eight voices can go to a different MIDI output, CV output or gate, so one track becomes an instrument you build out of the gear you already have. It also brings a redesigned Clip page, Sheet navigation, Clip Loops, freely assignable CV modulation and a Scale Detector.

Chapters
0:00 Intro, what's new in Rlx 1.9.0
0:27 Custom Track Outputs
1:10 Routing voices to CV, four Eurorack oscillators
1:55 Adding MIDI voices, an 8 voice hybrid polysynth
3:23 Drum Mode, a hybrid drum machine
5:12 Freely assignable CV for LFOs and Envelopes
6:18 The new Clip page
7:39 Scenes and scene follow-ups
8:09 Sheet navigation
9:08 Clip Loops
10:25 Scale Detector
10:56 Changelog, manual & Discord

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NIKOLATOR — Coming Soon

video upload by Hügelton Instruments

"A Tesla coil software synthesizer by Hügelton Instruments.

Follow on itch.io for the release.
https://hugelton.itch.io"

See the Hugelton label below for more of their creations.

4 Op FM on Microkorg 2 Synthesizer Custom Osc FM4OSC by Frostmod Audio

video upload by James Dyson

"4 Op FM on Microkorg 2 Synthesizer Custom Osc FM4OSC by Frostmod Audio 1st load up of the Osc lets see how it goes :)

New FM oscillator with 4 operators, 32 algorithms, individual feedback for each operator.
Support for microKORG2's patch/modulation matrix with destinations for:
operator 1, 2, 3, 4 feedback
operator 2, 3, 4 modulation amount to their targets
https://payhip.com/b/0VJ82"

Steda SR-BD9 909 Bass Drum eurorack module || Modular DEMO

video upload by bajjjan records

via Axel P: "Steda Electronics is launching a new series of Eurorack modules based on the individual voices of the 909, starting with the SR-BD9 kick module, currently available for pre-order at €55."

You might remember Steda from their SR-909 - TR-909 clones.

Classic vibes and analog mojo in 6 drum modules from GRB Instruments

video upload by bajjjan records

"6 New GRB Instruments drums for eurorack.
The modular analog drum machine with a classic vibes is almost ready!
There are 11 patterns/jams in this video."

GRB Basic Kick & GRB Hi-Hat || Modular DEMO

video upload by bajjjan records

CYMBAL

Sound is synthesized by a system of oscillators based on Schmitt triggers, that recreates the classic, complex sound of an analog cymbal. The sound is synthesized by a system of oscillators based on Schmitt triggers, operating at different frequencies. The mixing of these signals creates the rich, chaotic, and metallic spectrum.

You have direct control over the resulting texture. The TUNE knob shifts the overall frequency range of the metallic noise, while DECAY sets the length of the sound's wash and sizzle. The TONE control further shapes the character of the ringing, allowing you to fine-tune the brightness and timbre. This combination of controls lets you sculpt everything from a short, bright metallic click to a long, decaying noise.

For dynamic performance, the module features an ACC input (0V to +5V) to modulate the accent level and is triggered via the standard GATE input (+5V to +12V). The final, complex cymbal sound is available at the OUT jack.

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Catoff LFG. Variable Analog LFO.

video upload by temaniak - click CC for subtitles once the video begins.

Low Frequency Generator

Advanced LFO with five standard waves (triangle, sine, inverted sawtooth, sawtooth, square) and two modified waves based on triangle and sine the morphing of which can be controlled by CV.

Frequency range: 0,1Hz-100Hz (X1 range mode) / 0,01Hz-10Hz (X0,1 range mode)
Output signal amplitude depending upon the position of the BIAS control:
BIAS= 0: -5v/+5v
BIAS=-5: -10v/0v
BIAS=+5: 0v/+10v
CV inputs responds: -10v/+10v
EOC (End Of Circle) signal level: +5v / 1ms
Trig and Reset inputs threshold: 4v

Controls and sockets:
RATE Pot - Waves Frequency
BIAS Pot - Polarity offset from zero
TURN Pot - Morphing of two modified waves
Waves outputs 3,5mm jack sockets: triangle, sine, inverted sawtooth, sawtooth, square and 2 modified waves
EOC socket: End Of Circle impulse
Input 3,5mm jack sockets:
Trig - resets the wave and holds the reset when the gate is on
Reset - resets the wave and immediately resumes. Сan work as Sync input

Обзор Twang Modular RFE

video upload by temaniak - click CC for subtitles once the video begins.

"Resonator Filter Equalizer Eurorack module."

Equalizer/resonator/triple filter

There are a lot of ways to use RFE. Besides EQ and triple multymode filter, it can be a powerful sound source with FM posibilities. Use it like drone machine or triple VCO (it tracks about 4-5 octaves) or even a drum machine, it pings very well!

3 parametric sections with cv control of frequency, bandwidth and level;
3 analog filters with mode switch and mute push button;
simultaneous VCF sum and EQ outputs;
voltage control feedback.

Twang CPP - Crossfader-Polarizer-Panner

video upload by temaniak - click CC for subtitles once the video begins.

"Универсальный аудио - CV стерео-процессор от Twang."

"A versatile stereo audio-to-CV processor from Twang."

Crossfader/Polarizer/Panner with a twist.

CPP is a powerful processor for audio, but it also can be used with CV signals. It’s a great tool to work with a stereo field particulary and with a sound design in general. It can be a multitrack bus or individual panner. For small systems it can be end-of-chain mixing tool with vc crossfaders, vc panners and VCA’s.

The module consists of 4 sections: 2xCPP, Mid/Side, 2xVCA.
The first two channels are identical and the module is named after them. We have two signal inputs going to the crossfader, controlled with the knob and cv input. Additionally, there is a handy attenuverter to make cv control easier. After crossfader the signal goes to polarizer, which is actually a bipolar VCA and can be used as classic amplifier, ring modulator or inverter. It can be bypassed symply by routing the signal with switch directly to panner, then it can work independently. There is a dedicated input C for it. Thus we can get 3 input mixer inside one channel. In addition, it has 5V offset switch wich can be useful while processing a cv signals. The final stage is panner. It also has cv input and send our signal to sum in stereo.

The second channel is identical to the first one.

The third section is a “secret weapon” of stereo sound design – Mid/side encoder-decoder. L and R inputs are transforming to Mid and Side signals and then can be transformed to wide stereo field. There is no knobs to control this, but there a lot of ways to use it with other on board sections or with other VCA, VCF or FX modules.

The last fourth channel is a pair of VCA’s. There is a signal input, cv input and signal output. Both are the same and have level control knobs.

Finally, all input signals are summing to master output with deficated level control knob. If we use a channel’s individual output, it will be subtracted from the main mix.

Before Void Trigonometry || Modular DEMO

video upload by bajjjan records

Timeline:
Introduction — 0:00
Functions Demo — 0:56
Sample Stereo Movement — 6:42
One Shaper For Two Voices — 7:21
Trigonometry On Drums — 10:18
Two Simple Voices — 12:23
Stereo Distortion & Textures — 14:07
Folded Sine Bass — 15:08
Trigonometry On Drums 2 — 17:41
Heavy Atmospheric Distortion — 19:37
One More Jam Session — 21:05
Drone Rhythmic Shaping — 23:51

Before Void Trigonometry. Обзор.

video upload by temaniak - Click CC at the bottom of the player once started for subtitles.

Gilbert-Style sine shaper

Unique multi-output Gilbert-style sine shaper. The shaper offers wave shaping, distortion, folding, phase modulation including through-zero, and imitation stereo. These effects take the sound into West Coast territory. Shaper shematic from NCS MSK-13 project.

3VCA -> Shaper
2 Input 5V normalization

Benjolin X by Before Void || Modular Demo

video upload by bajjjan records

"Rob Hordijk Benjolin with Before Void mods

A deep dive into chaotic synthesis using the Before Void Benjolin X as the only one sound source.

All effects are generated within the Eurorack case: Before Void Trigonometry (Wave Shaper), Shift Line Astronaut (Reverb), Catoff 100FX (Reverb/Delay)

What you hear is the raw character of these modules. Post-processing is limited to mixing and compression only. No external EQ or VST plugins."

Before Void Benjolin X || First Jam

video upload by bajjjan records
"First Jam with Before Void Benjolin X and Roland TR09"

"Based on forestcover Benjolin

+clock rungler input (any signal such as puls, trigs, gates, clock)
+band pass filter output
+high pass filter output (capricious output, starts cutting low frequencies only when the resonance is raised from 30%)

Open-Source:
https://github.com/BeforeVoid/Chrongler

CC-By-NC 4.0, 2026.
Strictly for non-commercial use."

Before Void Trigonometry

video upload by bajjjan records

Timeline:
Introduction — 0:00
Functions Demo — 0:56
Sample Stereo Movement — 6:42
One Shaper For Two Voices — 7:21
Trigonometry On Drums — 10:18
Two Simple Voices — 12:23
Stereo Distortion & Textures — 14:07
Folded Sine Bass — 15:08
Trigonometry On Drums 2 — 17:41
Heavy Atmospheric Distortion — 19:37
One More Jam Session — 21:05
Drone Rhythmic Shaping — 23:51

"Unique multi-output Gilbert-style sine shaper. The shaper offers wave shaping, distortion, folding, phase modulation including through-zero, and imitation stereo. These effects take the sound into West Coast territory. Shaper shematic from NCS MSK-13 project."

AlM Introduces With Mixer - Stem Ripper Mixer Expander

video upload by ALM TV

"The With Mixer is a companion expander for the ALM Stem Ripper, adding a full-featured 8-channel stereo mixer with per-channel level and gain control, stereo panning, dual stereo aux sends, and mute and solo controls.

An easy-to-use graphical interface provides visual monitoring of all eight input channels and the stereo mix output, along with quick, precise control of all mix parameters. Mix parameters can also be controlled via CV or an external MIDI controller connected to the powered USB host port, providing hands-on control and making the With Mixer well suited to live performance. Complete mixer setups can be saved and recalled, while the display also shows the Stem Ripper's recording status and elapsed time. Together, the 'Stem Ripper With Mixer' pair provides a modern multitrack stereo digital mixing and recording setup to your Eurorack system in just 14HP."

Chapters:
0:00 - Intro
0:53 - Mix Setup
1:35 - Channel Parameters
4:07 - Aux Send 1 and 2
6:34 - CV Inputs
7:22 - CV Attenuation and Offset
7:57 - MIDI Controller Setup
10:52 - Global Mix Setting
11:26 - Outro

Additional details via Perfect Circuit

Capture and control your Eurorack mix like never before with the With Mixer from ALM Busy Circuits, a feature-packed expander for the ALM Stem Ripper that turns the recorder into a robust mixing set-up. While Stem Ripper offers a powerful, high-fidelity way to record multitrack audio in a Eurorack system, the With Mixer takes this functionality even further, incorporating all eight channels of Stem Ripper into a sleek and slim digital mixer for studio tracking and performance control alike. For each channel, the With Mixer enables level and gain control, stereo panning, two sets of stereo auxiliary sends for incorporating effects, as well as mute and solo controls. This vast feature set is available to any sized system, thanks to the incredibly hp-efficient 14hp space required by the full two module set-up. This compact size far outpaces the specs of virtually any other mixer in Eurorack, all while still being a multitrack recorder!

Adjust settings and keep an eye on both levels and recording time with the graphical interface, while hands on control is just as close at hand thanks to the powered USB host port, perfect for attaching your favorite MIDI controller for live mix control. Three CV inputs are available as well, which can be freely assigned to mix parameters to get signals moving with CV. By connecting a compatible AXON expander, you can add even more CV inputs for up to seven independent CV controls. In addition to saving settings between power cycles, With Mixer allows you to save and recall eight full mixes, making it a breeze to program live sets and perform with confidence. Whether you already enjoy the multitrack capabilities of Stem Ripper or are looking at the pair together, With Mixer from ALM is an expander that brings an incredible amount of new functionality to any system, providing an all-in-one mixing and recording workstation for any modular musician.

With Mixer Features

Digital mixer expander for ALM Stem Ripper
Mixes all eight channels of Stem Ripper with stereo output
Per-channel level / gain control, panning, dual stereo auxiliary sends, and mute / solo controls
Final mix is recorded to Stem Ripper alongside eight individual stems
3x assignable CV inputs
USB host connection enables control with your favorite MIDI controller
Graphical interface for visualizing and adjusting mix and recording parameters
Save and recall 8 complete mixer set-ups
Connect an Axon expander for additional CV inputs
Product Details

Eurorack module
Width: 8hp
Depth: 32mm
Current draw: 45mA @ +12V, 35mA @ -12V, 0mA @ +5V

A Private Virtual Roland D-70 for Linux! | Sound Demo

video upload by PixelWings

"I’ve always loved vintage Roland synthesizers and wanted a D‑70, but concerns about dealing with the dreaded maintenance nightmares the D-70 is known for kept me from buying one. Eventually, I decided to make my own software recreation: D‑70v.

This is a private, completely unofficial hobby project running on Linux, created for the pleasure of exploring and playing the wonderful D‑70 sounds. The GUI interface was drawn from scratch in GIMP, inspired by the original keyboard’s front panel, with functional buttons, sliders and a data wheel. The aim was to recreate not just the sound, but the experience of operating the instrument -but optimized for a computer screen as well as being able of running on an absolute potato. The core application is approximately 450 KB, excluding the required ROM data, and CPU usage is extremely low.

This video brings together a selection of my favorite D‑70 factory patches. I spent some time playing through the factory bank and later edited my favorite moments into this demonstration. It is simply an opportunity to enjoy the sounds and share my excitement about bringing this instrument into software. All instrument sounds and effects heard in this demonstration are generated by D‑70v itself. No external synthesizers or effects were used; the clips were simply selected, edited and faded together.

This is not an official Roland product and is not affiliated with or endorsed by Roland. It is purely a demonstration, not a software release. The project uses original Roland ROM data, and I am keeping it private. Neither the software nor the ROM data is being distributed, so please don’t request a copy.

Above all, this is a celebration of the D‑70 and an era of digital synthesis that I love. I adore vintage Roland, especially their legacy of late 80s and early 90s instruments, from the pro range to the "DTM" products. I hope you enjoy the demo, and please excuse my lack of playing skills."