Twisted-Electrons FLEXfm Brings FM Synthesis Into a New Groovebox

I’ve always been interested in grooveboxes that let you start with something relatively simple and gradually work your way toward an actual piece of music without having to immediately jump back into Ableton.

The idea sounds easy enough.

Put a synth, sampler, sequencer, and some effects in one box, then let the producer get on with making music. But anyone who has spent time with dedicated hardware knows that the experience can be very different depending on how the manufacturer decides those pieces should interact. Some instruments are excellent at coming up with an eight-bar idea and surprisingly tedious once you want to develop it.

Twisted-Electrons is taking a fairly ambitious swing at that problem with FLEXfm, its new hybrid groovebox, now available for pre-order after its appearance at Superbooth 2026.

Designed by company founder Alex Smith, FLEXfm combines eight independent voices, four-operator synthesis, sampling, analog and digital filtering, extensive modulation, and a sequencer with enough arrangement options to develop complete compositions. It also includes a joystick that does more than pitch bending, individual audio outputs for all eight voices, and a software companion for anyone who wants to move the music into a DAW.

It’s a lot to fit into one instrument, especially when the company is also emphasizing immediate, hands-on operation.

The analog filter is an important inclusion because digital FM can produce some extremely bright, aggressive upper harmonics. Having a dedicated analog filter for every voice gives producers a more traditional way of controlling that energy while retaining the unusual character of the underlying synthesis.

The Joystick Does More Than Change Parameters

I think hardware instruments often live or die by the quality of their performance controls.

You can put an enormous synthesis engine inside a box, but if getting around it feels like editing a spreadsheet, the instrument loses some of the appeal that made you choose hardware in the first place.

FLEXfm’s joystick is intended to make its deeper capabilities accessible while you’re actually playing.

It offers three different morphing approaches.

The first lets you blend between four sound variations, letting you move between patch versions without adjusting every parameter individually.

The second changes the operator algorithms themselves, altering the FM, AM, and ring-modulation relationships between the four sound sources.

That one is particularly interesting because changing an FM algorithm can dramatically affect the harmonic character of a sound. Instead of treating an algorithm as a fixed decision you make at the beginning of a patch, FLEXfm turns it into something you can manipulate during a performance.

The third morphing mode works with patterns, allowing the joystick to move between different musical variations.

That could be especially appealing for producers who enjoy creating several versions of a groove and working between them while recording or performing.

The joystick also doubles as a piano-roll cursor and supports pitch bends, scratching effects, phasing, and other rhythmic manipulations.

There’s even an integrated piezo pad for expressive playing and drum entry.

All of that suggests Twisted-Electrons wants the front panel to feel like an instrument in its own right, with plenty happening beyond the usual sequence of selecting a sound, programming steps, and pressing play.

Sampling Adds Another Dimension to the Sound Engine

Sampling is another major part of FLEXfm’s design, and it’s integrated into the synthesis engine.

The instrument provides eight mono sample pools at 44.1 kHz, with approximately 13 seconds available per pool and up to 16 slice markers.

You can record from the mono audio input, import WAV files, create 12-pad drum kits, and manipulate samples using tuning, playback position, reversing, and other parameters.

Samples can also be combined with synthesized operators.

That is an important difference from grooveboxes where the synth and sample engines operate as largely independent instruments.

By allowing samples to interact with other operators, FLEXfm gives producers more opportunities to treat recorded audio as raw sound-design material.

I can see that being particularly interesting for percussion. A relatively ordinary sample could become the starting point for an FM patch, with synthesized components introducing harmonics, pitch movement, or additional transient character.

The instrument also includes 32GB of internal storage for samples, songs, patches, recordings, and other project data.

For anyone interested in the broader hardware production approach, DAVI’s discussion of working with the Elektron Digitone offers another perspective on getting musical results from FM synthesis and hardware sequencing.

FLEXfm Availability and Pre-Order Pricing

Twisted-Electrons FLEXfm is available for pre-order directly from the company.

The introductory price is €999 including VAT until November 13, 2026. After that, the standard price will be €999 excluding VAT, with applicable taxes added.

The company expects to begin delivering units before Christmas 2026, although that remains an estimate. International shipping is available, with applicable import duties charged separately.

For producers interested in building an entire track inside a dedicated hardware instrument while retaining the option to move everything into a DAW, FLEXfm is one of the more intriguing new grooveboxes announced this year.

Learn more about FLEXfm and pre-order from Twisted-Electrons.