2hp — Comb

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Creative Modulation Guide for the 2hp Comb Eurorack Module

The 2hp Comb is a powerful, compact IIR peaking comb filter. With its cutoff frequency, resonance (capable of self-oscillation), feedback dampening, and abundant CV control, it offers a vast palette for sound design. Below, I've highlighted strategies to harness those features for unique distorted percussive sounds, aggressive basslines, and haunting pads. Each approach focuses on creative use of the module’s parameters and CV inputs.

Module CV Points & Controls

• FREQ CV Input: Controls cutoff/delay time (±5V)
• RES CV Input: Controls resonance/feedback (±5V)
• DAMP CV Input: Controls feedback path dampening (±5V)

1. Distorted Percussive Sounds

Goal: Create sharply attacked, metallic or shredded drum hits and glitch artifacts.

Patch Ideas:

• Source: Route clicks, short envelopes, or white noise bursts to IN.
• FREQ Control: Use a fast, snappy envelope or even trigger pulses via the FREQ CV In to sweep the cutoff at audio rate. This will cause intense, sometimes metallic transients—ideal for aggressive percussive timbres.
• RES Control: Crank the RES knob high (or modulate it with a steep envelope) so the comb filter teeters into self-oscillation when percussive signals hit. This adds harmonic clang (like hitting a metal plate).
• DAMP: Use a sharp envelope in DAMP CV In to briefly open the damp (fully clockwise) on attack, then close it (counterclockwise) to darken the decay. This creates “pingy” or splattering decay tails.
• Add Feedback: Turn up RES and use the DAMP control to push feedback into self-oscillation right as a percussive sound hits, then clamp it down to avoid runaway.

Advanced: Modulate all three parameters (Freq, Res, Damp) simultaneously with different envelopes or stepped random voltages to create evolving, unpredictable percussion.

2. Crazy Basslines (Dubstep/DnB Style)

Goal: Ridiculously resonant, growling, “torn” basses with moving peaks and synthetic character.

Patch Ideas:

• Source: Feed in a simple sub-oscillator (triangle, saw, or pulse) or dirty noise.
• FREQ CV: Use an LFO or sequencer track to modulate FREQ rapidly. Fast LFOs (audio-rate modulation) can create vowel-like, formant shifting growls.
• RES: Set high for squealing, overtone-rich peaks. Try modulating RES with a square or stepped random voltage to make the resonance jump or “chirp.”
• DAMP: Animate DAMP with an LFO or envelope inversely to resonance—e.g., when resonance goes up, damp opens, then vice versa. This keeps the sound moving and lively without overpowering feedback.
• Self-Oscillation: Push feedback to self-oscillation and modulate FREQ with envelopes or pitch CV. The result is a “re-triggered,” morphing resonator that can breathe and snarl—classic for neuro/DnB reese basses and dubstep growls.

Tips: For even more movement, mult a sequencer or random source to several CV inputs so all parameters move in complex, interrelated ways.

3. Haunting Atmospheric Pads

Goal: Ethereal, otherworldly washes with fluttering harmonics and evolving textures.

Patch Ideas:

• Source: Feed in sustained drones, chordal samples, or even slow granular textures.
• FREQ: Slowly modulate FREQ with a slow LFO or random smooth voltage (e.g., Turing Machine, Wogglebug). This adds subtly moving harmonic notches and peaks for evolving character.
• RES: Set to medium for gentle resonances. Use a secondary slow LFO to drift RES for swelling/receding harmonic emphasis—think of wind, breath, or shifting pitches in a cave.
• DAMP: Modulate DAMP gently around the mid-point with long, irregular envelopes or smooth random signals. The resulting brightness/darkness fluctuation brings morphing timbral shifts, akin to environmental motion.
• Serial Processing: Chain the Comb after a reverb or before a shimmer reverb to amplify the ghostly spatial effect.

Performance Tip: Use manual tweaking of all three knobs during a performance; slight, coordinated changes in FREQ, RES, and DAMP can lead a pad from serene to ominous to radiant with minimal patch changes.

Final Notes

General Tips: - Use audio-rate signals in CV inputs for wild FM-style effects. - Combine with wavefolders, distortions, or bitcrushers for harsher sound design. - Add subtle modulation for organic-sounding textures, or harsh stepped voltage for destruction.

Summary:
The 2hp Comb excels as a timbre-warping creative tool. Its full CV control means you can sculpt audio far more dynamically than with fixed filters—use it for impact, movement, and atmosphere.

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