VCV Rack Modules
The complete set of free, open-source SignalFunctionSet modules for VCV Rack. Most also run on the 4ms MetaModule. Filter by tag to find what you need.
14 modules
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
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.
Muse
A VCV Rack recreation of the 1972 Triadex Muse by Edward Fredkin and Marvin Minsky. Eight sliders tap a binary network to generate long, structured algorithmic melodies.
Shift
A 4-output CV shift register for VCV Rack. One signal in, four outputs each with its own delay, divider, and parallel-or-cascade mode, plus a jumbled bonus output.
Vac
A semi-stable attack/release envelope generator for VCV Rack. Per-stage stability controls introduce musical cycle-to-cycle variation, like a real vactrol drifting.
SignalFunctionSet Sequencer System
A modular rhythm and pitch sequencer system for VCV Rack. Meter is the time-signature-aware master clock; Beat sequences drums; Note sequences pitched voices.
Swell
A ping-driven envelope generator for VCV Rack. Each trigger adds a soft-saturating rise; the envelope decays back toward zero with linear-to-exponential curve shaping.
Intone
A formant synthesis voice for VCV Rack based on the IRCAM CHANT project. Five parallel FOF cells with vowel morphing, audio excitation, and trigger modes.
Tine
A tunable 3rd-order pingable resonator for VCV Rack based on the Gamelan Resonator circuit from Paul DeMarinis' Pygmy Gamelan (1973).
Phase
A dual sample looper for VCV Rack inspired by Steve Reich's tape phase compositions. Two loops drift against each other to generate evolving phase relationships.
Overtone
An additive synthesis VCO for VCV Rack that builds waveforms by toggling individual harmonics of the overtone series. CV-controllable mask and filter inputs.
Fugue
An 8-step harmonic deviation sequencer for VCV Rack. Generates three voices of evolving counterpoint from a single melodic sequence using interval offsets.
GSX
A real-time granular synthesis module for VCV Rack inspired by Barry Truax's pioneering GSX system. Grain density, duration, pitch, and spray under full CV control.
Drift
A 4-channel chaos LFO for VCV Rack with independent phase offset, per-channel scaling, and waveform morphing from sine through chaos. Built for generative patches.
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Frequently asked questions
What is SignalFunctionSet?
SignalFunctionSet is a collection of free, open-source modules for VCV Rack and the Critter & Guitari EYESY, developed by Stuart Frederich-Smith. The VCV Rack set spans sequencers, oscillators, filters, envelopes, granular and additive synthesis, and more.
What is VCV Rack?
VCV Rack is a free, open-source virtual modular synthesizer for macOS, Windows, and Linux. It recreates the Eurorack modular experience in software, letting you patch together modules from many developers. SignalFunctionSet modules run inside VCV Rack.
Are the SignalFunctionSet modules free?
Yes. Every SignalFunctionSet module is free and open source, available through the official VCV Rack Library. There is no paid tier and no license fee.
How do I install the modules?
Browse the SignalFunctionSet plugin in the VCV Rack Library, click Subscribe (it is free), then open VCV Rack and use the Library menu to sync. The modules appear in your module browser. You can also download each module from its page on this site.
Can I run these modules on hardware?
Most SignalFunctionSet modules also run on the 4ms MetaModule, a hardware Eurorack module that plays VCV-style plugins. Fugue has additionally been ported to the Expert Sleepers Disting NT as fugueNT. Each module page lists the platforms it supports under Downloads.
Are the modules open source?
Yes. The full source for the VCV Rack plugin is on GitHub, so you can read the DSP, learn from it, or build it yourself. Many of the modules are based on historical works in computer music and document their references.
Can I use the modules in my own music?
Yes. The modules are free to use in your patches, performances, and recordings, including commercial releases. The music you make is yours.