Twisted Electrons FLEXFM: Hybrid Sampling FM Groovebox Teased

TL;DR: Twisted Electrons is teasing the FLEXFM, an upcoming 8-voice hybrid groovebox that mashes 4-operator FM synthesis with live sampling and per-voice analog multimode filters. It’s a hand-built prototype slated for Superbooth 2026, and it promises step sequencers with pattern morphing, a modulation engine, and individual outs per voice. No price or release date yet, but our coffee-stained fingers are already twitching.

• 8-voice hybrid groovebox with one voice per track, each featuring a 4-operator FM synth (32 engines per operator) plus a sampler with live sampling via line input.
• Per-voice multimode analog filter borrowed from the TwistFM polysynth, with hardware cutoff and resonance controls.
• Built-in effects (delay, reverb) and a modulation engine, plus a step sequencer per voice with pattern morphing algorithms.
• Individual outputs for each voice, stereo main out, headphone jack, MIDI I/O, and USB connectivity.
• Groove-focused features include a chord generator, scales, and pattern-centric workflow — still in development, price and availability TBA.

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The rebel with a YMF

We at Noxal have a soft spot for manufacturers who ignore the herd and march to their own firmware. Twisted Electrons’ Alex has been doing exactly that for years — remember the BlastBeast, that beautifully unhinged FM groovebox built around the vintage YMF-262 chip? It sounded like a Sega Sound Blaster having a nervous breakdown in the best possible way. So when Alex teases something new for Superbooth 2026, we sit up, pour another coffee, and pay attention.

The FLEXFM is currently a single-photo tease on Instagram, a hand-built prototype that Alex will show off at Superbooth. I had a brief chat with him, and even in those few sentences, I could sense the same gleeful disregard for convention. This isn’t a rehash of every other groovebox on the market — it’s a hybrid that wants to be both a vintage FM synth and a modern sampling workstation, all wrapped in a compact box with analog filters.

What is FLEXFM, exactly?

Let’s dig into the specs, because there’s plenty to unpack. FLEXFM is an 8-voice hybrid groovebox, and each voice gets its own track — so 8 tracks, 8 voices, no sharing. Every voice contains a 4-operator FM synthesizer with 32 engines per operator. That’s a lot of mathematical mayhem under the hood, and it suggests the engine is flexible enough to cover everything from glassy chimes to metallic percussion to full-on digital noise sculptures.

But wait — alongside the FM part, each voice also has a sampler with live sampling capability via the line input. That means you can drop in external audio, slice it, mangle it, and layer it with your FM sounds. It’s a hybrid in the truest sense: digital synthesis meets sample playback, all in one voice. The screen already shows delay and reverb parameters, so you’re not left dry. A built-in modulation engine rounds out the sound design toolkit.

Analog filters and per-voice insanity

Here’s where my pulse quickens. Each voice features a multimode analog filter with dedicated cutoff and resonance controls on the hardware. Alex confirmed it’s the same filter as in the TwistFM polysynth — a solid, characterful circuit that can go from smooth to snarling. Having an analog filter per voice in a groovebox at this price tier (whatever it ends up being) is rare. Most competitors rely on digital filtering or a single shared analog filter. Per-voice means you can process each track independently, which is a huge deal for live performance and sound layering.

Connectivity-wise, the FLEXFM doesn’t skimp: individual outs for each voice, a stereo main output, headphone jack, MIDI I/O, and USB. Individual outs alone make this a studio workhorse — you can route each voice to its own channel on your mixer or interface, apply external effects, or process them through your favourite outboard gear. That’s a feature usually reserved for pricier flagship boxes.

Sequencing, morphing, and the beat

The groovebox name isn’t just for show. FLEXFM puts a heavy focus on beats and pattern generation. Each voice gets its own step sequencer, and Alex mentioned “pattern morphing algorithms” — though he kept the details close to his chest. Morphing could mean smooth transitions between patterns, interpolation of note data, or something more esoteric. We’ll have to wait for Superbooth to see it in action.

There’s also a chord generator, scales, and other “musical goodies” onboard. That suggests the FLEXFM isn’t just a drum machine with FM — it’s designed for melodic and harmonic content too. Chord generators on hardware are still a rarity, and when done right, they can turn a monosynth-style box into a full arrangement tool. I’m hoping Alex includes some polyphonic capability, even if it’s via chord voicings rather than true polyphony per track.

Market context and who should care

So how does the FLEXFM stack up against the current groovebox landscape? The obvious comparison is Elektron’s Digitone — a beloved FM-based groovebox with a sequencer that defined a generation of producers. But the FLEXFM is a different animal: it’s more vintage in its FM architecture (likely inspired by the YMF chip lineage), adds sampling and analog filters, and offers individual outs. The Digitone has a single stereo output and digital filters. The FLEXFM feels like a more experimental, hand-built alternative — less polished, perhaps, but with more character.

Who is this for? Producers who love the sound of classic FM chips but want modern sampling and analog warmth. Beatmakers who want per-voice analog filtering without selling a kidney. Live performers who need individual outs and pattern morphing. And anyone who respects a developer who builds prototypes by hand, talks to users directly, and doesn’t follow the herd. At Noxal, that’s exactly the kind of gear we get excited about — flaws and all.

I’m going to need a second espresso just to process the idea of per-voice analog filters on a groovebox. If Alex brings a working prototype to Superbooth, I might need a third. No promises, but I’ll update this article before my mug runs dry.