TB-303 vs RE-303 A/B with new BA662a from Analogue Renaissance

video upload by
decoder303
"Exciting times, our friends from Analogue Renaissance have developed a new BA662a clone which seems to be 2 levels above known clones. It performs exactly the same as the original chip and you can listen to it in the RE-303 here (this chip is also used in various other Roland synths and drum machines of that time, which makes it even more exciting). The comparison isn't highly scientific just with some extreme settings of the parameters, but you can get the idea that with some more penible pot adjustment they are pretty much indistinguishable. As always with a lovely resonance, which doesn't sound harsh or sibilant but always has this silky nice tone to it, where all the smd clones fail for a reason :)"

Akai S900 SuperOS v4.0 Firmware Update: Timestretch and Live/Midi Filter Modulation

video upload by superOS-303

"In this video we go over the features we have added to the Akai S900 SuperOS v4.0 Firmware. We have implemented timestretch from the Akai S950 and also live/midi filter modulation to the control knob.

We have only tested this on an Akai S900 with eeproms 1.2c running a Gotek FlashFloppy emulator on version 3.42.

Where to buy: https://superos303.com/shop/superos-a...
How to install: https://superos303.com/doc/s900

I do not have any more information about installation or how to install other than the tested unit we have described."

SuperOS-303 Firmware Part 1: Pattern Write Mode

video upload by superOS-303

"Hello! This is a video going over features in the Pattern Write mode of the SuperOS-303 Firmware written for the Michigan Synth Works VOX DEI. This firmware runs on the MSW VOX DEI, which is a D650C replacement for the Roland TB-303.

SuperOS-303 Docs: https://superos303.com/doc
SuperOS-303 Github: https://github.com/bjornlustic/SuperO...

Michigan Synth Works VOX DEI: https://michigansynthworks.com/produc... OS-303 Github: https://github.com/djphazer/OS-303"

SuperOS-303 Firmware Part 2: Web Editor

video upload by superOS-303

"Hello! This is a video going over some features in the Web Editor for the SuperOS-303 Firmware written for the Michigan Synth Works VOX DEI."

Happy TR-808 day - SuperOS-808 Introduction [New Firmware for the Roland Tr-808]

video upload by superOS-303

"Hello! Today on August 8th, 2026, we are introducing our new firmware for the Roland TR-808. We go over a few of the additions that we have made.

This firmware works on the Michigan Synth Works Vox DEI which is coming soon with an updated version to support the TR-808.

You can check out our firmware here:
https://github.com/bjornlustic/SuperO...

You can check out the docs here:
https://superos303.com/doc/808

Our web editor is available here:
https://superos303.com/editor/808"

Custom FLUX theremin synth

video upload by Love Hultén

"My custom FLUX 👽 incl Galaxy ’74 and Golden Reverberator"

Yamaha CS30 service and external clock modification

video upload by Jörg Schaaf

"The internal sequencer of the CS30 does not sport an external sync input for the internal sequencer. Furthermore, the CS30 circuitry is designed for 15 Volt gate signals. Eurorack synthesizers are specified with 5 Volt trigger signals. The modification adds an external input at the backside of the synth. When you set the sequencer to manual mode, the external input is active. It does not replace the manual button. Instead it's adding a second sync source. That means, you can still select the starting step of the sequencer line with the manual button.

Are you looking for a synthesizer workshop or do you want to add mods to your vintage synth? Then maybe my synthesizer-service.de website is a good starting point.

https://www.synthesizer-service.de"

Indtroducing AcidBoxMynah

video upload by MoShang

"AcidBoxMynah is an alternative firmware that turns the Mynah into an acid groovebox. Based on the open source AcidBox project for ESP32. It provides an acid combo of tb303 + tb303 + tr808 like synths. Filter cutoff, reso, env mod, accent, wavefolder, overdrive within each 303, per-instrument tunings, hi-pass/lo-pass filter and bitcrusher in drums, send to reverb, delay and master compression

While the original project is headless, the AcidBoxMynah fork provides direct control with the Mynah hardware and adds a number of additional features detailed in the user Manual below. Like the original firmware, the AcidBoxMynah is open source and made available under the MIT license.

More info at https://groovesizer.com/"

Update: press release follows:

"Hot on the heels of Mynah's launch this past May, Groovesizer has released AcidBoxMynah - a free, open-source alternative firmware that transforms the ESP32-S3-based sampler into a dedicated acid groovebox.

Built on copych's open-source AcidBox project, AcidBoxMynah takes what was originally a headless engine and gives it a full physical UI on Mynah hardware - 24 tactile switches, an 8×2 NeoPixel grid, OLED display, and a single pot for hands-on parameter control. Under the hood, it's a combo of two TB-303-style synths plus a TR-808-style drum machine, with filter cutoff, resonance, envelope mod, accent, wavefolder and overdrive per synth voice, plus hi-pass/lo-pass filtering and bitcrushing on the drums, all routed through send effects and master compression.

The Mynah fork adds a 16-step sequencer with per-step note, accent and slide editing, 16-lane synth and 8-lane drum automation, scale quantization, swing, and manual Sequencer Mode in addition to the original's autonomous Jukebox Mode. Quality-of-life additions include runtime drum kit browsing, per-voice muting, and pot-lock to prevent accidental parameter jumps.

Like the original AcidBox, it's fully open source under MIT license.

Switching is effortless. Owners can flash AcidBoxMynah straight from the Mynah web app's firmware tab and swap back to standard Mynah firmware anytime - AcidBoxMynah keeps its own folder on the SD card, so nothing overwrites or conflicts with existing samples and patterns.

AcidBoxMynah is available now at groovesizer.com/acidbox-mynah."

Vintage Vocoder w/ Bigfoot Music Sticker on Back

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

This one was spotted and sent in via
M Me.

via this eBay listing

"Superb vintage Vocoder unit.

Unable to find out much information online about this to be honest - there's a 'Bigfoot Music' sticker on the back, but I'm pretty certain that was probably a shop rather than the maker.

I have tested the 'Speech' side and it was all working fine, sounds great!

I couldn't get a sound from the right side (ex.) but I'm no expert on these so maybe it's just a case of flipping the correct switch.

I also haven't tested the rear inputs/(outputs?) as I'm not sure what they're for.

Great chance to own a rare piece of vintage music gear!"

If anyone has any additional information on this one, feel free to leave a comment below. It almost looks DIY.

CLICK FOR MORE »

Doctor Mix C-64 Synth Series

video uploads by Doctor Mix

"👉 🔥 PLAY MY C64 SYNTHESIZER — FREE, IN YOUR BROWSER: https://doctormix.com/doctormix64 🔥 👈 This is the one. My Commodore 64 synthesizer is FINALLY finished — and it came out better than I imagined. 🎹"

"Sam from Look Mum No Computer built me the control panel, but I'd been keeping it in an ugly functional box that was destroying the look of the C64. So in this episode I build it a proper detachable enclosure from scratch — measuring, cutting, gluing, a LOT of sparks, and one or two moments where I call myself an idiot on camera. 🔥

Then the good part. SID chip number one was completely dead — so I repaired it. Which means there are now TWO vintage SID chips running at the same time, one hard left, one hard right. That's not a stereo effect. That's two synthesizers playing together. 🎚️

And somewhere along the way I fell down the electronics rabbit hole — learning the oscilloscope, building my own MIDI tester out of a £12 screen and a microcontroller, and using AI to modify the firmware so the C64 screen now says DOCTOR MIX instead of Cynthcart. Being able to dominate your own electronics is MASSIVE.

Oh — and I built a virtual version of the whole thing that you can play in your browser for free. It's very beta, almost alpha, but it's real and it's yours. Link at the top ⬆️"

Casio SK-8 Sampling Keyboard + Patch Bay + Pitch Mod

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

via this Reverb listing

"Rare 1987 Casio SK-8 8-bit sampling keyboard modified with a unique raised console featuring a 20 point ROM modulation patch bay, four illuminated preset effects switches and an illuminated pitch control. This is an otherworldly instrument which will inspire any alternative electronic musician and sound designer. Reed Ghazala named his modified SK units 'Aleatrons' due to their random, unexpected nature so nothing is obvious here- when the patch matrix is in use, the keyboard itself doesn't always function as you'd expect while the modifications open up a world of experimental audio possibilities, far outreaching Casio's original intentions. The pitch controller is switchable and can drop sampled sounds to crashing, aliasing lows.

CLICK FOR MORE »

Jeannie 2

video upload by Rolf Degen

"DIY blog https://www.sequencer.de/synthesizer/..."

Roland TR-626 with mods

video upload by Ground Grown Circuits

"Some extra knobs on the TR-626.
Top knob controls sound ROM clock (kinda like a bit rate control) lower knob controls the Gate array clock (pitch). Normally the gate array controls the clock on the sound ROM, so separating them allows you to keep the bit rate high while lowering the pitch and not fully bit crushing the sound (unless you want to)"

Analogue Solutions DJMC 2000? - CUSTOM DIY CASE

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

via this Reverb listing

"Analogue Solutions DJMC — Rare Dual Joystick MIDI Controller (Discontinued / Cult UK Gear)

WITH ORIGINAL DOCS- YOU'RE GONNA NEED THOSEAnalogue Solutions DJMC — Rare Dual Joystick MIDI Controller (Discontinued / Cult UK Gear)

WITH ORIGINAL DOCS- YOU'RE GONNA NEED THOSE

iNSTALLED IN CUSTOM DIY CASE , midi IN, OUT AND THRU

A genuine piece of underground electronic music history: the DJMC by Analogue Solutions, one of the UK's most respected true-analog synth builders. Long before "expressive control" was a marketing buzzword, Analogue Solutions built this twin-joystick MIDI controller with crossfader for performers who wanted real, tactile, two-axis-at-once control over their sound — no touchpads, no menus, just raw hands-on movement.

This thing was never mass produced. Analogue Solutions has since shifted entirely toward their acclaimed eurorack and analog synth lineup (Colossus, Leipzig, Telemark, Nyborg, and more), and the DJMC has completely vanished from their current catalog — it doesn't show up anywhere on their site today. they almost never surface secondhand. If you've been hunting for one of these, you already know how rare a find this is.

Perfect for:

Collectors of obscure UK analog gear
Live performers wanting expressive dual-axis control (filter/resonance, X/Y FX, pitch/mod)
Modular heads running MIDI-to-CV for joystick-driven patching
VJs/lighting rigs that read standard MIDI CC
A genuine, hard-to-find piece from a small builder with a serious cult following in the analog synth world — grab it while it's here, because another one might not turn up for a long time

iNSTALLED IN CUSTOM DIY CASE , midi IN, OUT AND THRU

A genuine piece of underground electronic music history: the DJMC by Analogue Solutions, one of the UK's most respected true-analog synth builders. Long before "expressive control" was a marketing buzzword, Analogue Solutions built this twin-joystick MIDI controller with crossfader for performers who wanted real, tactile, two-axis-at-once control over their sound — no touchpads, no menus, just raw hands-on movement.

This thing was never mass produced. Analogue Solutions has since shifted entirely toward their acclaimed eurorack and analog synth lineup (Colossus, Leipzig, Telemark, Nyborg, and more), and the DJMC has completely vanished from their current catalog — it doesn't show up anywhere on their site today. they almost never surface secondhand. If you've been hunting for one of these, you already know how rare a find this is.

Perfect for:

Collectors of obscure UK analog gear
Live performers wanting expressive dual-axis control (filter/resonance, X/Y FX, pitch/mod)
Modular heads running MIDI-to-CV for joystick-driven patching
VJs/lighting rigs that read standard MIDI CC
A genuine, hard-to-find piece from a small builder with a serious cult following in the analog synth world — grab it while it's here, because another one might not turn up for a long time"

CLICK FOR MORE »

PlantsSystem-KOSMOS3 InteractiveReverb

video upload by plantssystem

"KOSMOS3 is an interactive reverb instrument that transforms reverberation from a static audio effect into a playable, responsive acoustic space. Instead of applying a fixed ambience, KOSMOS3 continuously reshapes its internal reverb field based on incoming audio, gestural control, and real‑time modulation signals.

At its core is a multi‑parameter reverb engine capable of smooth, expressive morphing across decay, diffusion, pre‑delay, and spectral balance. These parameters respond immediately to performance input, allowing the reverb to behave like a dynamic environment rather than a background effect.

Key features include:

Interactive control via MIDI, OSC, TouchOSC, and HID
Real‑time modulation for shaping spatial texture during performance
Headless operation suitable for installations and long‑running setups
Instrument‑like behavior where the reverb becomes an active part of the performance

KOSMOS3 functions not merely as an effect processor but as a playable acoustic space—a reverb you can push, bend, and sculpt in real time."

PAiA Proteus Vintage Synthesizer Demo - For Sale

video upload by tonetweakers

"Here’s the PAIA Proteus vintage analog synth we recently restored, a process requiring 21 hours of skilled vintage synth tech time. Read about it on our website.

Buy vintage gear that works like new at tonetweakers.com

We buy sell trade refurbish vintage synths and electronic musical instruments."

Two classic 1980's #synthesizer recreations for less than $30? And Eurorack compatible. How...?

video upload by voltryx

"A Juno-6 and DX7?"

"In this video I take a look at the AMY board: a tiny, affordable ($29) Arduino-based DIY synth module built around the open-source AMY synth library. It packs USB, an SD card slot, digital and analog audio, MIDI, and CV I/O into a board small enough to fit straight into a Eurorack case.

I go over what the board actually is and what's in the box, then jump into a MicroPython REPL to show how the AMY library's synth, voice, oscillator model works, patching up a simple sine voice, triggering notes, and using the built-in PCM/sample engine and tag-based sequencer to create a basic drum pattern. From there I install it in my Eurorack rack, run through the signal chain (MIDI in from the Hermod+, CV/audio out, self-modulation via CV), and share some closing thoughts on where it's strong, where it's limited compared to something like the Disting NT, and what I want to try next (serum-style bass patches with compression/distortion).

If you've got one of these boards — or you're thinking about picking one up — let me know what you're building with it in the comments.

Timestamps:
0:00 Intro & preview
0:31 What is the AMY board?
1:43 Using AMY standalone (MIDI / SysEx / REPL)
2:01 MicroPython REPL walkthrough — synths, voices, oscillators
3:01 PCM sample oscillator & built-in sequencer (drum pattern)
4:22 AMY in the Eurorack rack — signal chain & modulation
6:04 Final thoughts — value, limitations, what's next
7:01 Outro"

Hermetic Modular - Launch Announcement - New Open Source Eurorack Manufacture

video upload by Hermetic Modular

"Introducing a new modular synthesis company. Shipping early July.

Hermeticmodular.com

Open source!

Thank you to Victory Nguyen for performing, Justin Benjamin for the good camera work (all bad camera work should be attributed to me), and Greg Dixon for some of the excellent sound design demos."

How do you test 36,700 LEDs?

video upload by Hermetic Modular

"Run a burn in test! Enjoy 10 minutes of the uninterrupted test - an important step in the QA process. This runs for a minimum of five hours per board.

Proper eurorack LED ring pot feedback.

And all 3060 of these LEDs pictured passed :)

Music credit to @adamwonak on IG - "abstract" from 202606 on Bandcamp now."

ECHOA STEREO DUAL DELAY AND REVERB PROCESSOR

Four delay lines total — two per stereo channel. Morph delay into reverb from first principles, from clean digital delay to smeared, textured reflections. Route the four lines in series, parallel, isolation, or spectrally. Presets, parameter lock on every pot, character engines, and more.

TIME
Delay time from 1 ms to 16 seconds, up to four taps per delay line, configurable for your sound design. Feedback up to and past unity, and a dry/wet mix per channel. Freeze delay buffers, set tempo with tap on the line buttons, or patch a clock and lock each line to a musical division. Linear or logarithmic time taper options: a full featured, clean delay line.

SPACE
Bend echoes into reverb. Diffusion sweeps a four-stage Schroeder all-pass network from discrete repeats to a wash. Bloom grows short, fixed loops into long modulated plate and hall tails. Damping is bipolar from noon — counter-clockwise darkens the tail, clockwise thins and brightens it.

ENGINE
Degrade each line's voice across with four engines — digital, BBD, tape, vinyl. Saturation, bandwidth limiting, compander, wow and flutter, hiss, crackle, digital glitches. Depth scales from bit-pristine bypass, to a gentle touch of character, to destruction.

CONFIGURABLE FOR PERFORMANCE ROUTING
Parallel, series, mono, or spectral delay-line topologies.

CV MAPPING
Per-CV destination, with attenuverters on every input.

CLICK FOR MORE »

Minitron synth (Mellotron+Minilogue)

video upload by Love Hultén

"Commission piece incl Mellotron M4000D, Korg Minilogue, Microcosm, Chroma Console and a custom tape echo. In the video I’m using the Mellotron as lead over a Minilogue seq, but the synths can also be played simultaneously for joined voices"

See the Love Hulton label below for additional creations.

Please steal this FM synthesizer UI idea (ESP32-P4 DIY FM synth)

video upload by Floyd Steinberg

"I built a simple 4 operator FM synthesizer using Elecrow's 10.1 ESP32-P4 smart screen ( https://tidd.ly/4yIlbuX ). Nothing groundbreaking, but I want to show you an UI idea I had, and if you're convinced, please start using it in your FM synths.

00:00 hi, what's this?
01:03 ESP32-P4 panel features
02.47 How to install ESP-IDF 5.4.4 in Visual Studio Code
04:29 A problem with common FM synthesizers
06:13 Reminder: FM principles
06:43 My UI idea
08:22 Sound demo
09:10 Conclusion

Thanks, www.elecrow.com

HÄLP ZIS CHANNEL
https://www.patreon.com/floyd_steinberg
https://floydsteinberg.gumroad.com/
https://floydsteinberg.bandcamp.com/"

This 4HP Eurorack Module Just Got INSANE

video upload by wgd modular

⏱️ Chapters
00:00 – Intro
00:14 – What happened since the last video? [embed below]
00:54 – New panels
01:17 – Fixing the noise problem
01:50 – Melon in live performances
02:03 – Firmware flashing infrastructure
02:32 – Updates to existing firmwares
03:08 – New firmwares
03:18 – Metal Hit
04:14 – RALPS
04:50 – Reese Bass
05:29 – Drums
06:26 – fxloperformer
07:29 – Final thoughts


"In this video, I’m taking a look at what has happened to melon since my last video. My 4HP Eurorack adaption of Hagiwo’s amazing RP2350-based MOD2 has grown quite a bit since then, with new panels, new firmware, community contributions, and improvements to the overall infrastructure.

CLICK FOR MORE »