SignalFunctionSet

Plugins for VCV Rack and the Critter & Guitari EYESY, desktop software for samplers and synths, and workshops on synthesis and sound design.

VCV Rack

Free, open-source modules for VCV Rack. Most also run on the 4ms MetaModule.

OP ENV VCV Rack module panel, a standalone DX7 operator envelope generator with per-stage rate and level offsets

OP ENV

A standalone DX7 operator envelope generator for VCV Rack. Loads a voice from a .syx bank and turns its carrier envelope into a gate-driven CV, with per-stage offsets.

 Operator VCV Rack module panel, a 6-operator DX7-style FM synth voice with voice selection and polyphonic output

Operator

A 6-operator FM synth voice for VCV Rack in the Yamaha DX7 lineage. Loads DX7 .syx cartridges, plays them polyphonically, and ships with classic Brian Eno patches.

 Cycle VCV Rack module panel, a bar-synced quad LFO with four channels, morphing shapes, and clock and bar inputs

Cycle

A bar-synced quad LFO for VCV Rack. Four channels lock to your song's bar grid with morphing shapes, per-channel depth, and clock-quantized staircases: built to pair with Meter.

 Band VCV Rack module panel: harmonic bandpass bank with four colored bands and a spectrum display

Band

A harmonic bandpass bank for VCV Rack inspired by Suzanne Ciani. Four narrow filters lock to integer harmonics of a shared fundamental that auto-tracks the input.

 Gravity VCV Rack module panel: 30HP chaos and motion engine with a large circular display and a mandala of CV/gate jacks

Gravity

A 30HP multi-mode chaos and motion engine for VCV Rack. Six engines drive a moving point read out as bipolar X/Y CVs, six sector CVs, and six boundary-ray gates.
View all 17 VCV Rack →

EYESY

Visual modes for the Critter & Guitari EYESY video synthesizer.

Image Trip EYESY mode: a static image distorted into flowing kaleidoscopic animation

Image Trip

An EYESY video synth mode that transforms static images into flowing kaleidoscopic animations by stretching and repeating rows and columns of pixels.

 String Vibrations EYESY mode: a 3D field of vibrating strings rendered in green on black

String Vibrations

An EYESY video synth mode that renders incoming audio as a scrolling 3D field of vibrating strings. Each string shows the waveform at a different moment in time.

 Cubicles EYESY mode: a 3D wireframe matrix of cubes pulsing with brightness in response to audio

Cubicles

An EYESY video synth mode: a 3D wireframe cube matrix with depth-of-field effects that pulses with brightness and color highlights in response to audio.

 Tempestuous EYESY mode: a vector-style 3D tunnel rendered in green wireframe on black

Tempestuous

An EYESY video synth mode inspired by classic vector arcade games: fly through a 3D tunnel that warps and pulses in response to incoming audio.

Software

Desktop tools that make working with samplers and synths less painful.

SampleStack desktop app screenshot showing the sample library, collection editor, and preview pane

SampleStack

A desktop sample manager for Eurorack and hardware samplers. Organize, browse, convert formats, and transfer sample libraries without the painful CLI workflow.

 EYESY Simulator desktop app showing a video synth mode rendering with knob controls and audio source selector

Eyesy Simulator

A native macOS and Windows simulator for the Critter & Guitari EYESY video synthesizer. Develop, test, and preview video synth modes without the hardware.

Workshops

Slide decks and materials from workshops on synthesis and sound design.

Intro to Synthesis workshop title slide: Synth Library Portland header logo on a teal background

Intro to Synthesis

An interactive slide deck covering the fundamentals of subtractive synthesis: oscillators, filters, envelopes, LFOs, and the classic voice architecture.

 Granular Synthesis Workshop poster artwork: orange cloud-like granular texture with workshop title

Granular Synthesis Workshop

Workshop materials on granular synthesis: interactive timeline, curated mixtape, and historical notes from Fourier to Mutable Instruments. Run at Synth Library Portland.

Writing

Notes and essays on synth tool design, workflow, and the practice of building instruments.

What's new in 2.15

Release notes for SignalFunctionSet 2.15: two new DX7 modules, Operator and OP ENV, plus a gate-length overhaul across the sequencers.

 Workbench scene of building synth modules with Claude: code, panels, and hardware ports

Eight months building modules with Claude

Notes from eight months of building VCV Rack, MetaModule, and Disting NT modules with AI assistance.

Cheat Sheets

Quick references for the gear and platforms our modules run on.

MetaModule Cheat Sheet

A quick reference for the 4ms MetaModule: button combos, knob mapping shortcuts, Knob Sets, MIDI, the action menu, patch operations, settings, and expanders.