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+---- Thread: GOOD NEWS, EVERYONE! SY FM4 is here + a fully modular Syntakt firmware builder! (/showthread.php?tid=85)
GOOD NEWS, EVERYONE! SY FM4 is here + a fully modular Syntakt firmware builder! - kariGardarsson - 10-20-2026
Well, I've been busy again
Two big updates this time
First, SY FM4 is now available for Syntakt OS 1.41!
I've ported Rxuting's 4-operator FM engine to OS 1.41, bringing 11 FM algorithms to SY TONE, along with a second SYN page, eight FM parameters, native editing, parameter locks and sound save/reload
ALGO 0 keeps the original SY TONE behavior, while ALGO 1–11 give you the new FM engine
And second, I've built a fully modular Windows firmware builder!
Instead of downloading a fixed collection of mods, you can now pick exactly what you want in your custom Syntakt firmware
The builder includes eight selectable mod groups:
- SY FM4 — 4-operator FM synthesis
- Master Compressor
- FX3 — Chorus, Flanger, Phaser and Crusher
- Beat Repeat
- Déjà Vu LFO
- Expanded SY CHORD — 31 additional waveforms
- Dual Mono Input
- Readable Parameter Values
The builder handles dependencies automatically, so you don't need to worry about which supporting mods are required
Just select your official Syntakt OS 1.41 firmware, choose your mods and hit Build
No Python, no WSL, no programming required!
Everything runs locally on Windows, and the builder doesn't connect to your Syntakt or flash anything automatically
All 255 possible non-empty mod combinations have passed automated structural validation, and I've also successfully tested the combined MAX + FM4 firmware on my own Syntakt
A quick heads-up: This is still experimental firmware. I've tested quite a bit on real hardware, but definitely not every possible combination or workflow. Some combinations, including the new standalone FM4-only builder profile, still need broader hardware testing
I'd recommend backing up your projects and sounds and keeping the official OS 1.41 handy. If you ever need to revert, Syntakt has a recovery mode (FUNC + TRIG 4 at startup) that allows reinstalling the official firmware over MIDI DIN. Recovery instructions are included with the builder
Feedback, testing results and bug reports are always welcome!
Huge thanks to:
- Rxuting — for creating the original SY FM4 engine
- Angelo-politek — for SyntHack, the original mods and modular infrastructure
- Bezronczek — for the original Déjà Vu and CHORD implementations
The builder uses your own official Elektron OS 1.41 file. No Elektron firmware or prebuilt firmware images are distributed
GitHub release:
https://github.com/karigardarsson/Synthack-OS/releases/tag/syntakt-max-modular-builder-rc1
Have fun experimenting!
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Quick development update!
I'm investigating two issues reported by MAX 1.0 users: FX3 controls appearing on MIDI tracks and a brief compressor level dip during FUNC + NO operations
I've reproduced the MIDI UI issue on hardware and I'm checking whether the new Modular RC1 configurations are affected too
I'll share an update when the fixes are verified
Thanks for all the feedback and testing!
RE: GOOD NEWS, EVERYONE! SY FM4 is here + a fully modular Syntakt firmware builder! - petedorky - 10-21-2026
Very nice! May I ask why it's a Windows app and not a website like modwerk.app? Wouldn't a website be more versatile (also for Apple folks)?
RE: GOOD NEWS, EVERYONE! SY FM4 is here + a fully modular Syntakt firmware builder! - rumirum - 11-08-2026
This is so cool ! Thanks for this work
