The open-source Mutable Instruments Plaits code has become one of the most widely reused pieces of synthesis DSP in modern music tech. It turns up in Eurorack clones, in iOS apps, in hobbyist firmware, and increasingly in commercial plugins. The newest arrival is Tresse, the debut instrument from a new company called Våld Labs.

Two Layers, Thirty-Nine Engines

Tresse is a dual-layer synthesizer plugin. Each of the two layers carries eight voices and 39 macro-based synthesis engines. Twenty-four of those are derived from the Plaits codebase; the remaining fifteen are original developments by Våld Labs.

That second group is the one worth reading twice. It includes Karplus-Strong, sympathetic strings, a 64-mode modal resonator, CZ-style phase distortion, bytebeat, a wavefolder, complex FM, drawbars and granular. All 39 engines share the same core set of UI controls, which is the defining virtue of the macro-oscillator approach — you can move between a modal resonator and a wavefolder without relearning an interface.

Modal resonators and sympathetic string models are precisely the engine types that reward physical playing. A modal resonator's character lives in how hard and where it is struck; a sympathetic string model lives in what else is sounding at the same time. These are physically-informed engines, and they respond to gesture in ways that a sawtooth simply does not.

Each layer also gets an Oberheim SEM-style morphing filter, built on the open-source filter work of Vadim Zavalishin and Andy Simper, plus two ADSR envelopes, drift, master detune, portamento, chorus and a bipolar crush/distortion stage. Layers play polyphonically, in mono legato, or in up to eight-voice unison.

Modulation comes from three multi-wave LFOs with 50 destinations spread across layers, filters, effects, mixer balance and sequencer parameters. A multi-FX section adds delay (digital, tape, ping-pong, lo-fi) and reverb (hall, room, plate, shimmer).

A Generative Sequencer, Not a Step Grid

The other headline feature is the built-in sequencer, which uses the same generative engine as Våld Labs' forthcoming Vekte MIDI sequencer plugin. It offers seven distinct algorithms: wave interference, Euclidean, random walk, logistic map, cellular automata, Kaprekar and Fibonacci.

Patterns run up to 32 steps, with step durations from a 1/32 note to two bars, plus density, probability, swing, humanize, note length, strum, ties, chords, four playback directions and twelve scales. An 11-mode arpeggiator sits alongside. Two tempo-synced parameter automation lanes use the same generators as the note sequencers, so the same mathematics that drives the notes can drive the timbre.

Usefully, a Join and Split function lets you drive both layers from one sequencer or give each layer its own.

Hardware in Q1 2027

Våld Labs says Tresse began life as a hardware design, and the hardware version is still planned: a three-voice polyphonic desktop synthesizer built around the ESP32-S3 chip on a custom PCB, targeted for Q1 2027.

That is an ambitious voice count for the platform, and three voices is modest — but for anyone watching the market for affordable expressive hardware, an ESP32-based polysynth carrying modal and Karplus-Strong engines is worth tracking. Whether it ships with per-note MIDI input is not yet public, and it is exactly the question to put to the developer while the design is still open.

What MPE Players Should Check

The plugin's announced feature set covers engines, filters, modulation, effects and sequencing. MPE is not listed among them. For an instrument packed with physically-modeled engines, that is a gap worth raising directly with the developer — sympathetic strings and modal resonators under per-note pressure and slide are a different instrument entirely from the same engines under a mod wheel.

Developers do listen on this, and several of this year's MPE additions to existing plugins started as user requests. If you want it, ask for it.

Price and Availability

Tresse is available now at an introductory €19.99, down from €29.99, until 30 September 2026. It runs as a standalone application and as VST3 and AU plugins on macOS (native Apple Silicon and Intel) and Windows. An iOS and iPadOS version is in beta and described as coming soon.

More information: Våld Labs

Sources: Synth Anatomy