KOSMOS features a custom timing architecture that delivers an extremely stable, ultra‑low‑jitter MIDI Clock (24ppqn). Whether you use DAWs, hardware sequencers, drum machines, or modular gear, KOSMOS provides a rock‑solid master tempo designed for professional, performance‑ready synchronization.
---
๐ Key Features of MIDI Sync Mode - Microsecond‑accurate MIDI Clock Built on the RP2040’s dual‑core architecture, the clock engine is fully isolated from UI tasks, ensuring stable timing with no drift.
- Transport Control Support - Start (0xFA) - Stop (0xFC) Use KOSMOS as the master clock to control external devices with a single command.
- BPM Color Feedback (Visual State Indicator) - Green = Idle - White = Playing - Red = Stopped A minimal, intuitive UI that shows the system state at a glance.
- Perfect DAW Integration Works seamlessly with Ableton Live, Renoise, Logic, Elektron gear, Volca series, and more.
---
๐ What is KOSMOS? KOSMOS is a minimal, RP2040‑based Generative MIDI Instrument designed to create smooth, deep, expressive musical motion. Floating passages, bouncing phrases, rotating patterns—KOSMOS generates music that feels alive.
MIDI Sync Mode extends this expressive engine to your entire hardware ecosystem.
---
๐งฉ Technical Highlights - RP2040 dual‑core architecture - Microsecond‑level clock generation - Full separation of UI and clock processing - Optimized MIDI real‑time messaging - USB‑MIDI support
---
๐ฆ Open Source KOSMOS is an open‑source project. Source code, documentation, and the latest releases are available on GitHub. https://github.com/plantssystem/KOSMOS"
"This is the new Public Domain SID or PDSID by Matthias. I hope to be able to make and supply these with MIDISID. In the mean time, they're available direct from him and can easily be fitted.
"This is a test of the latest version of my self contained 6 voice polysynth board. it has 6 dual DCOs with super saw, square with PWM and a triangle, a standard saw, square with PWM and a sub oscillator. These are fed into AS3372E analogue filters configured the same as the matrix 12 filters for 16 variations of LP, HP, BP, notch etc. Each voice has 3 ADSRs, 3 LFOs and a noise source."
"In this video we look at the early history of #expressive synthesizers, and why #Trautonium is my favorite design. Then we make a #synthdiy Trautonium using an #otamatone as the oscillator. I also share a change in priority for Sound Workshop."
Experience the latest evolution of KOSMOS, a generative music instrument built on the RP2040.
Version v1.3.1 focuses on refinement and stability, polishing the feel of the instrument without changing its core behavior.
What’s new in v1.3.1
Improved splash screen for a smoother startup experience
Sequencer bug fixes and subtle behavior adjustments
Enhanced stability across the A/B parts and arpeggio engine
Minor UI refinements for more reliable performance
KOSMOS continues to evolve as a minimal, expressive, and organic generative instrument — designed to create fluid musical motion with depth and character."
"KOSMOS v1.3.0 introduces a breathing dual‑voice engine with a new LCD interface and Waveshare Pico‑Audio integration.
Organic octave drift, rhythmic patterns, and scale‑based motion create a living generative instrument.
Click the auction link on top when you get there for additional listings.
"Set of Three Phutney PCB Cards – EMS VCS3 / Synthi A Clone A set of three fully built Phutney PCB cards for the EMS VCS3 / Synthi A. These are the highly regarded clone boards designed by Derek Revell, widely considered among the most accurate reproductions available for anyone wishing to recreate one of these classic synthesizers, or to replace cards in an original EMS instrument.
The boards were professionally assembled by an experienced audio engineer, using new old stock germanium and silicon transistors to get as close as possible to the character of the original EMS circuitry.
They have been extensively tested and calibrated in my 1975 EMS Synthi AKS. My original intention was to use them to build a VCS3 “Cloney”-style synth, but that project never materialised.
During testing, resistor values were carefully adjusted until the cards performed and sounded indistinguishable from the original EMS circuit boards.
The sale also includes: • Header and PCB solder-in edge connectors to simplify wiring during a build • A set of blue edge connectors with solder tags if you prefer the more traditional “old-school” wiring approach
All three boards are fully populated, tested, and confirmed working. As mentioned, they were bench-tested and run inside a working EMS Synthi AKS, allowing direct comparison with original EMS cards during calibration.
If you are planning to build a vintage EMS-style synthesizer, this is an excellent starting point, as the boards are already assembled, tested, and carefully tuned to match the performance and sound of a 1975 Synthi A / VCS3."
"Offered here is a truly unique and intriguing analog synthesizer, discovered at an estate sale in Los Angeles belonging to a longtime record collector. This piece appears to be a custom-built or prototype-style instrument inspired by classic ARP designs—featuring elements reminiscent of both the ARP 2600 and later Odyssey models.
The layout, switching, and signal flow strongly reflect deep knowledge of vintage ARP circuitry, while the construction suggests a highly skilled builder with access to professional-grade metalwork and components. The unit is housed in what appears to be an ARP pedal synthesizer case, though the internal assembly is not permanently mounted—indicating this may have been a custom project or experimental build. It has one etched circuit board on a module and the rest are on perfboard with point to point wiring.
Notable features:
ARP 2600-style panel layout with Odyssey-style switching influences
Point-to-point wiring with included schematic diagram
Separate keyboard connected via cabling
Vintage analog components throughout
Powers on (unit lights up), though full functionality has not been tested
Whether this is a one-off custom build, a studio project, or an experimental instrument from a knowledgeable enthusiast, it represents a fascinating piece of analog synthesis history. With some restoration or calibration, it has the potential to become a highly expressive and unique instrument."
"TRS MIDI is great but the fact that there are 2 standards makes it a nightmare. I got tired of dealing with it so I made this little adapter box. Life is so much better now. I thought I'd share it.
Intro - 0:00
The TRS MIDI problem - 0:28
Fixing the Problem - 3:25
Building the Box- 5:57
"The demo is in 3 parts: Manual mode 4:15, Sync mode 9:46, and external mode 14:07
'Radio buttons' is an expression used for a row of buttons where a button stays down when you press it. You press another button and the first one will pop up again while the other button stays down.
It is possible to make such a device with simple pushbutttons and a few logic gates instead of the complicated (and expensive) mechanical locking switches. This is what I explore in the beginning of this video - and it is actually exploring since I haven't used the concept before so I didn't know if it would actually work. I do know that the old Moog Taurus bass synthesizer used a similar idea for its preset buttons.
The music is also a kind of exploration project since I decided for the first time to (over)use the portamento function on my Elka X-30 organ in an arrangement. Apart from the organ I also use my Roland JV-35 for some of the parts"
"GreyScale 'Phase3'
Centered around the Duos, the Poly-Sequencer receives its pulse, and sound rises up as a single structure.
This series records the "acoustic architecture" created not merely by synchronization, but by moving with the same heartbeat.
Minimal pulses shape the space,
and as the CS-10, Prophet-5, and Duos layer upon each other, you can follow the process of how GreyScale's unique three-dimensional sound develops.
This playlist is an archive of GreyScale's exploration of 'pulses create the world.'
----
GreyScale 「Phase3」
Duos ใไธญๅฟใซ、Poly‑Sequencer ใใใฎ่ๅใๅใๅใ、้ณใใฒใจใคใฎๆง้ ใจใใฆ็ซใกไธใใฃใฆใใ。
ใใ ๅๆใใใฎใงใฏใชใ、ๅใ้ผๅใงๅใใใจใง็ใพใใ“้ณ้ฟใฎๅปบ็ฏ็ฉ”ใ่จ้ฒใใใทใชใผใบใงใ。
ใใใใซใชใใซในใ็ฉบ้ใๅฝขใฅใใ、
CS‑10、Prophet‑5、ใใใฆ Duos ใๅฑคใ้ใญใชใใ、 GreyScale ็ฌ่ชใฎ็ซไฝ็ใชใตใฆใณใใ่ฒใฃใฆใใ้็จใ่ฟฝใใใจใใงใใพใ。
ใใฎๅ็ใชในใใฏ、GreyScale ใๆขๆฑใใ
「ใใซในใไธ็ใใคใใ」ใขใผใซใคใ。"
"'Navipanel V3 for MicroDexed' (or MicroDexed Desktop - https://www.musikandmore.net/shop/ ) adds a nice user interface and many connections to the open source synth. Here's an overview.
