Based on the manual, this is a 2hp Comb module: an IIR peaking comb filter with:
That means it can work not just as a tone-shaping effect, but as a pitched resonator, a self-oscillating voice, or a melodic exciter/filter when paired with other Eurorack modules.
A comb filter imposes a series of harmonic peaks onto incoming audio using a very short delay line. In practice, this gives you a few musically useful behaviors:
As you tune FREQ, the harmonic spacing changes, often producing a perceived pitch.
Feedback-based ringing
At high settings, the module can self-oscillate, meaning it can generate a tone on its own or sustain resonant tones from tiny transients.
Brightness and decay shaping
So in a patch, Comb is ideal for turning: - clicks into notes, - noise into strings, - simple oscillators into tuned harmonic material, - modulation into animated melodic textures.
This is the most direct “melodic” use of a comb filter.
Each transient excites the filter like striking a string or resonant body. This creates: - plucked tones - tuned percussion - pseudo-karplus voices - melodic pings
Use with: - trigger source / sequencer - envelope with very short attack/decay - VCA or transient generator - noise source for more “string” texture
Sequence the transient source rhythmically, and use CV into FREQ to change the note for each step. This gives you a playable resonator voice.
Since the manual states the module is capable of self oscillation, you can use it as a sound source.
You can get a pitched tone that behaves like a resonant oscillator. Depending on settings, it may be: - sine-like - hollow - metallic - unstable in a musically interesting way
This works well for: - lead lines - drones with pitch motion - ghost melodies - tuned feedback voices
Because comb filters are not always calibrated for precise 1V/oct tracking, treat this as an experimental pitched voice unless you confirm stable scaling in your system. A quantizer before the CV input can still help create musical intervals.
The manual specifically hints at “lustrous string sounds from white noise,” which is exactly where a comb filter shines.
You get a synthetic plucked-string or harp-like voice.
Comb can also reshape an already-pitched oscillator into something more complex.
This creates: - phaser-like thickening at subtle settings - tuned harmonic reinforcement - metallic doubling - shifting overtone emphasis
The base oscillator carries the note, while Comb adds a second layer of pitch-related coloration. This can make simple sequences feel: - more animated - more acoustic - more vocal - more “played”
Comb is excellent for tuned percussion because it naturally rings at a frequency related to the delay time.
You can create: - tuned toms - claves - mallet tones - synthetic marimba / string-hit timbres
This is especially useful if you want a rhythm track that also contributes pitch content.
The module has CV over all three important parameters, which makes it much more than a static filter.
Patch: - sequencer CV - quantized random - sample & hold - slow envelope - keyboard CV
Use it for: - changing notes - glides and bends - subtle detuning around a fixed center - pseudo-arpeggiation
Patch envelopes or velocity-like CV into RES CV.
Use it for: - stronger resonance on accented notes - notes that bloom into feedback - dynamic contrast between dry and singing tones
Patch an envelope, LFO, or sequencer lane into DAMP CV.
Use it for: - brighter attacks, darker tails - alternating muted/open notes - evolving harmonics over a phrase
This is especially effective for making repeating sequences feel alive.
Goal: melodic plucks
Patch - Noise source → VCA → Comb IN - Trigger sequencer → envelope → VCA CV - Pitch CV sequencer → FREQ CV - Comb OUT → mixer / VCA / effect
Settings - RES: high but below runaway oscillation - DAMP: middle to high - FREQ: set to a useful note range
Sound - Harp-like - Koto-like - Synthetic string plucks
Goal: use Comb as a voice
Patch - Minimal excitation or none at input - Raise RES until self-oscillation starts - Sequencer / quantizer CV → FREQ CV - Optional envelope or VCA after output
Settings - RES: very high - DAMP: to taste - FREQ: tuned by ear
Sound - Hollow sine-ish lead - Fragile resonant melody - Feedback flute / wire tone
Goal: rhythm and melody at once
Patch - Trigger pulse or click source → IN - Sequencer CV → FREQ CV - Accent envelope → RES CV - Output → reverb
Settings - RES: medium-high - DAMP: lower for darker percussion, higher for metallic ringing
Sound - Tuned pings - Bellish percussion - Resonant hits that imply a melody
Goal: enrich a simple mono sequence
Patch - VCO → Comb IN - Pitch sequencer → VCO - Slow LFO or secondary sequencer → FREQ CV - Envelope or accent CV → DAMP CV
Settings - RES: low to medium for subtlety - DAMP: medium - FREQ: tuned to support the bass register
Sound - Thicker bass - Moving harmonics - Phaser/physical resonance hybrid
Goal: convert noise into playable pitched texture
Patch - White noise → IN - Quantized CV → FREQ CV - Slow modulation → DAMP CV - Gate-controlled VCA before or after Comb
Settings - RES: high - DAMP: experiment from dark to bright
Sound - Bowed/string-cloud textures - Shimmering melodic beds - Atmospheric tonal textures
Comb works especially well in these roles:
If pushed into self-oscillation or excited by transients, it can become: - a lead - a pluck voice - a tuned drone
Placed after: - noise - impulses - short envelopes - percussive clicks
…it becomes a melodic resonant body.
Placed after an oscillator, sampler, or drum voice, it adds: - pitch-focused coloration - ringing overtone structures - animated resonance
From the manual, the most important melodic strengths are:
A few practical points:
Since only one module manual is attached here, I can only analyze Comb directly. But in a typical melodic Eurorack setup, this module works especially well together with:
If you upload the other module manuals too, I can give you a much more specific module-by-module combined patching guide for creating basslines, leads, plucks, drones, arps, and chord-like textures from the whole set.
The 2hp Comb is very effective for melodic work when used as:
For melody, the key move is:
excite it with short sounds, tune with FREQ, sustain with RES, and shape brightness/decay with DAMP.