Custom gear. Limitless sound.

Karels Synthworks

Bespoke synth mods, smart MIDI controllers, firmware experiments, and maker-built tools for musicians who would rather solder than settle.

⚙ Mods ▦ Controllers </> Firmware 🔧 Tools
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Built by a maker. For makers.

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Deep Mods

Unlock the weird magic hiding inside good hardware: keybed conversions, internal upgrades, custom panels, and practical fixes.

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Smart Controllers

Launchpad workflows, MIDI gloves, expressive performance rigs, and hardware profiles that make instruments feel alive.

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Open & Hackable

Clean firmware, practical docs, and designs meant to be repaired, remixed, and improved instead of locked in a black box.

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Bench-Tested

Real-world gear for real-world musicians: built with patience, tested on the desk, then abused until the weak spots confess.

Featured Creations

Current build ideas

JD-Xi Mod Suite

Full-size keybed dreams, hidden firmware ideas, performance fixes, and a proper pro-instrument path for Roland’s little monster.

Launchpad Mini FW

Custom modes, hardware profiles, grid sequencing, and DAWless control surfaces that punch above their tiny plastic weight.

MIDI Glove Controller

Wearable control for filters, scenes, breakdowns, motion gestures, and whatever the stage goblin demands next.

Synth Tools

Small utilities, editors, MIDI boxes, testers, and bench helpers for people who keep one eye on the scope.

Projects in the lab

Hardware with fingerprints on it.

Not vaporware. Not corporate beige. Karels Synthworks is for the hands-on musician: the person who reads service manuals, saves weird old gear, and knows the best ideas usually start with “bro, what if…”

Proudly rooted in Luxembourg

Rou, wäiss, blo — with a lion in the machine.

The look pulls from the Luxembourg flag and Roude Léiw spirit, then welds it to a dark synth-bench aesthetic: red power, white precision, blue signal.