Open instruments for VCV Rack
Kurkesmurfer
Original digital instruments shaped by unusual hardware, careful reconstruction, and hands-on musical use.
The first collection
SpaceTime
A modular, multi-playhead arbitrary function generator inspired by the Buchla 248 MARF. Program one field of stages, then move up to eight independent heads through it.
Release preparation
- VerifiedVCV Rack build and host test suite on Apple Silicon
- BuiltmacOS arm64/x64, Windows x64, and Linux x64 packages
- TestingRelease-candidate builds; Intel macOS, Windows, and Linux acceptance pending
- TestingFused 64-stage, eight-head MetaModule Core on hardware
Quadrature spectral tools
Homodyne
Six patchable building blocks explore the lock-in amplifier as an instrument: amplification, variable-bandwidth filtering, quadrature oscillation and demodulation, phase splitting, and polar computation.
Twenty-one oscillator instrument
Muse
Muse is a dense stereo drone voice animated by a field of oscillators and low-frequency modulators. Muse-XT extends it with a consonance control that reduces the broad harmonic space to progressively simpler interval families.
Motion-sensitive wavefolding
Inflection
Four independent mirror folders make the fold spacing respond to signal motion. Slow shapes remain broad while fast edges can drive into tighter, denser reflections.
Ninety-nine-stage phase laboratory
MultiPhaser
A stereo all-pass network with continuously addressed stages, sixteen selectable tap pairs, CV and clock scanning, and a compact variable-Q phase voice.
MetaModule
Open instruments, adapted for embedded use.
Kurkesmurfer maintains independent MetaModule ports with public source, hardware test notes, direct downloads, and clear credit to the original authors.
Latest development
Two more instruments enter the public baseline
Inflection and MultiPhaser gain clean public source histories and explicit cross-platform test status.
Two new fields of sound
New collection pages document the VCV release candidates and the work still ahead.
SpaceTime learns to talk back
Controller feedback, HEAD ALL, and 64-stage operation reach tested use.
A home for community ports
The Schlappi ports gain a permanent, attributable release page.
Working principles
Specific instruments, transparent lineage.
Kurkesmurfer projects credit their inspirations, separate original work from reference material, and publish source, manuals, limitations, and test status together.