The module library
The synthesis module library.
A field guide to 88 kinds of synthesis modules — oscillators, filters, envelopes, sequencers, effects, drums, and the originals that inspired them. Read how each one works. Try a working version in your browser, free, no install.
Oscillators
- VCO — The voltage-controlled oscillator — the primary sound source in any subtractive synth voice.
- LFO — The low-frequency oscillator — the modulation source that makes a patch breathe, sweep, and groove.
- SINE — A pure sine VCO. One knob, one input, one output. Nothing to get wrong.
- TRI — A mellow triangle VCO. One knob, one input, one output. Soft-edged and warm.
- SAW — A bright sawtooth VCO. One knob, one input, one output. The classic subtractive starting point.
- SQR — A hollow square VCO at 50% pulse width. One knob, one input, one output.
- Noise — A multi-color noise source with built-in sample-and-hold — the random voltage at the heart of every modular system.
- Wave Osc — The wavetable oscillator — scan through banks of single-cycle waveforms to make timbres that morph, drift, and evolve.
- Complex Osc — The complex oscillator — two oscillators, FM, and a wavefolder in one module — the heart of West Coast synthesis.
- FM Op — A DX7-style FM operator — sine oscillator, envelope, and feedback in one — the building block of frequency modulation synthesis.
- MI-Plaits — A browser port of Mutable Instruments Plaits — a macro oscillator that bundles 24 synthesis engines and a built-in low-pass gate into one module.
- MI-Rings — A browser port of Mutable Instruments Rings — a resonator with six physical-modeling modes that turns any input into ringing strings, modal bells, or sympathetic chords.
- MI-Elements — A browser port of Mutable Instruments Elements — a complete modal synthesis voice that bows, blows, and strikes a tunable resonator.
- WR-921 — The WR-921 - a standalone voice oscillator with four simultaneous waveforms, switchable AUX, and a CLAMPING phase-reset trigger.
- WR-921A — The WR-921A Oscillator Driver - a control-only module that sums pitch CVs and pulse-width CVs and broadcasts them to a bank of WR-921B voice oscillators.
- WR-921B — The WR-921B - a voice oscillator driven by a WR-921A driver, producing four simultaneous anti-aliased waveforms.
Modulators
- ADSR — The ADSR envelope generator - Attack, Decay, Sustain, Release: the four-stage shape behind every classic synth note.
- AD — A two-knob envelope: attack, decay. Snappy plucks, percussive shapes, the simplest way to make a note rise and fall.
- Amp — A simple voltage-controlled amplifier. One knob, two jacks: open the gate with CV, scale with LEVEL.
- LFO — A two-knob LFO: one for speed, one for shape. The simplest way to make a patch breathe.
- VCA — The voltage-controlled amplifier - the gate between sound and silence in every synth voice.
- Func Gen — The function generator - envelope, LFO, slew limiter, and complex modulation source in one module.
- Reval — Dual discrete-core VCA with built-in overdrive - a colored amplifier that shapes and saturates signals in one stage.
- WR-911 — The WR-911 - a four-stage ADSR envelope generator with exponential time segments and both V-trig and S-trig gate inputs.
- WR-902 — A modular VCA - linear or exponential, three summing CVs, fixed control voltage knob.
Tools
- FACES — See any CV six ways: bar, wave, dial, star, ripple, phase.
- KEYS — A click-only one-octave piano keyboard. Touch a key, get V/Oct and a gate.
- MIDI In — MIDI-to-CV bridge - turn a hardware keyboard or DAW into V/Oct, gates, and modulation CV.
- MIDI Out — CV-to-MIDI bridge - drive external synths, drum machines, and DAWs from inside the rack.
- Scope — Dual-trace oscilloscope - see your audio and CV in the time domain, sample by sample.
- Spectral — FFT spectrogram - see harmonics, sidebands, and filter sweeps in the frequency domain.
- Stream In — Capture any browser tab as a CV-modulatable, filterable audio source inside the rack.
Utilities
- BTN — A big chunky button. Press for a gate, a clean trigger pulse, or both at once.
- Mult — Buffered multiple - send one signal to many destinations without level loss or pitch drift.
- S&H ASR — Sample and hold plus 8-stage analog shift register - the classic stepped-random voltage source.
- Quantizer — Pitch quantizer - snap any control voltage to the nearest note in a chosen scale.
- 8vert — Eight channels of attenuation, inversion, and DC offset - the swiss-army utility of any modular rack.
- CV Mix — Three-channel CV mixer with attenuverters - sum, invert, and offset modulation sources.
- Logic — Boolean logic for gates - AND, OR, XOR, comparators, and a flip-flop in one panel.
- Mutes — Eight-channel mute matrix - silence any channel by hand or under gate control.
- Rescale — Reshape a control voltage - attenuate, invert, offset, and clamp a signal into the range you need.
- Compare — Window comparator - turn a continuous voltage into gates, mins, maxes, and rectified signals.
- Gates — Gate and trigger toolkit - edge detection, flip-flop, gate length shaping, and gate delay.
- Process — CV processor - sample-and-hold, track-and-hold, slew limiter, and portamento glide in one strip.
- Bernoulli — Probabilistic gate router - flip a weighted coin on every trigger and send it to A or B.
- WR-961 — The WR-961 Interface - trigger-format glue between S-trig and V-trig conventions.
- WR-994 — The WR-994 - two banks of passive multiples, the simplest possible module in topology.
- WR-CP3A-O — The WR-CP3A-O - an oscillator-controller console panel: switchable CV routing, attenuated EXT input, mult and trunk jacks.
- WR-CP35 — The WR-CP35 console panel - four chain-normalled attenuators, two passive mults, and +/- 6 V references.
Filters
Sequencing & Clock
Mixing & Output
Effects
- Delay — A stereo delay with ping-pong, freeze, clock sync, and tape-style feedback coloration.
- Reverb — Stereo reverb with both an algorithmic Freeverb engine and partitioned-FFT impulse response convolution.
- Chorus — A lush stereo tri-chorus with three delay lines modulated 120 degrees out of phase, inspired by the Roland Juno-60 and Solina String Ensemble.
- Distort — Five-mode distortion: tube-style soft clip, hard clip, Buchla-style wavefolder, octave-up rectifier, and bitcrusher.
- Distant Horizons — A 22 HP multi-algorithm stereo reverb built on a 4x4 Feedback Delay Network with shimmer, freeze, and full CV control.
- Secunda — A 22 HP four-head tape delay with spring reverb, deep tape modeling, sound-on-sound looper, and phrase sampler.
- MI-Clouds — Mutable Instruments Clouds, compiled from the original C++ to WebAssembly - granular, time-stretch, looping delay, and spectral processing in one module.
- MI-Warps — Mutable Instruments Warps, compiled from the original C++ to WebAssembly - a meta-modulator that morphs between crossfade, ring mod, XOR, wavefolder, and vocoder.
- Looper — A 28 HP performance looper with overdub feedback, variable speed/reverse, and 60 seconds of buffer for live ambient layering.
Drums
Sequencing
Sequencers
Mixers
Open Webrack →
Synths.pw and the Classic-series modules are not affiliated with, endorsed by, or sponsored by Moog Music Inc. Module numbers reference the late-1960s American modular tradition and are used in a historical sense.