Sketchy Labs DS-3100 Fully Polyphonic Synthesizer, Part 1: The Beast

video upload by Doc Sketchy

"After stringing along my followers on Mod Wiggler, I have finally made a video demonstrating the core circuitry of my polyphonic synthesizer project, the DS-3100 -- my homage to the Korg PS-3100, but done in Doc Sketchy style, with PCBs laid out in Excel, fully handmade and based entirely on my own original circuitry."

Plasma OptoSynth

video upload by Tim Kaiser

Scrotum Lab - A selection of works

video upload by batchas

Mega Command Live (MCL) TUTORIALS

video uploads by Acid Gray

Playlist:

1. Mega Command Live (MCL) TUTORIAL 01 - Basic Functionalities (Conditional Trigs, Micro-Timing...)

I received my MCL just two days ago. Here, I show some very simple and basic functionalities of the unit (it's much easier than I expected).

A significant benefit for this classic and amazing machine!

0:00 Intro - What is the MCL?
0:46 MIDI-Connection
0:54 Create Project
2:27 Power up MD
3:07 Let's Make a Beat!

Find more resources here:
https://www.elektronauts.com/t/megaco...

CLICK FOR MORE »

GreyScale-Dots #kosmos #midisyncmode

video upload by plantssystem

"@plantssystem-ufo
KOSMOS – Ultra‑Stable MIDI Sync Mode

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.

---

🎛 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.

---

🌌 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.

---

🧩 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

---

📦 Open Source
KOSMOS is an open‑source project.
Source code, documentation, and the latest releases are available on GitHub.
https://github.com/plantssystem/KOSMOS"

Using the New Public Domain SIDs in MIDISID

video upload by MIDI IN

"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.

Public Domain SID at uni64.com:
https://uni64.com/shop/index.php?syst...

MIDISID:
https://peacockmedia.software/midisid/"

Self contained 6 voice polysynth board

video upload by Craig Barnes

"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."

Turning the Otamatone into a Trautonium

video upload by Sound Workshop

"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."

Featuring the Sound Workshop Wiggler.

WTV Synth (through echo)

video upload by Tim Kaiser

Pentangle Synth

video upload by Tim Kaiser

With rotary phone controller.

GreyScale-KOSMOS v1.3.1 #kosmos #generative #instruments #pra32u

video upload by plantssystem

"‪@plantssystem-ufo‬

https://github.com/plantssystem/KOSMOS

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."

3x182 sequencer clone with Roland 100m #synth #vintagesynth

video upload by funkpirateradioscene

100M techno

video upload by funkpirateradioscene

GreyScale-KOSMOS v1.3.0 #kosmos #generative #synthesizer #sequencer #pra32u #electronicmusic

video upload by plantssystem

"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.

Project page: https://github.com/plantssystem/KOSMOS"

Reco-Jam

video upload by Arthur Joly

NES-SY2.0 Nintendo homage synth by Love Hultén

video upload by Love Hultén

Ulysses LFO Synth

video upload by Tim Kaiser

Three Phutney EMS clone PCBs, Tuned

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

via this Vemia listing

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."

CLICK FOR MORE »

Rare Custom DIY ARP-Style Analog Synthesizer – One-of-a-Kind Estate Find

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

via this eBay listing

"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."

CLICK FOR MORE »

How to fix TRS MIDI for about $10

video upload by Musical Miscellany & More

"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

Buy Me a Coffee: https://buymeacoffee.com/musicalmisce..."

Some more videos about MIDI


And more Musical DIY Projects

Mike's Multimoog Restore/Demo

video upload by synthpro

"Hey Guys,
In this video, I bring you along the adventure of a sick little Multimoog that now has a full bill of health. Thanks for watching!

Sincerely,
Jareth"