Cognate Aperture

Cognate Aperture — clean high/low cuts, tone shaping, gentle warmth — all in one block.

A transparent low cut (high-pass) and high cut (low-pass) paired in a single block, with emphasis cut and boost and an optional touch of tape saturation on the output. Use it for everything from gentle framing of the frequency range to creative and dramatic filter effects.

The two filters tame rumble and smooth the top end. Emphasis adds musical body or air around each corner, and Warmth contributes subtle, level-compensated tape character on the way out.

We took our filter design from Cognate Kinetic and expanded it with five selectable slopes: off, 12, 24, 36 or 48 dB/oct. At 12 dB/oct you get a gentle rolloff with a flat passband and minimal phase change. Push it up to 48 dB/oct for a hard cut with surgical precision.

The Emphasis controls voice each corner musically — a small body scoop or low-end bloom around the low cutoff, a tame or air around the high one. Proportional-Q bells positioned away from the corner, so cuts read as tone shaping, not a second rolloff.

Warmth adds anti-aliased, tape-style saturation on the output. Level-compensated so it never pushes you into clipping — the higher you turn it, the more analogue thickening and sweetening you get without losing headroom. The sound of mixing into a touch of tape; at zero, the path is exactly clean.

With steeper slopes, higher corner boosts and the frequency swept from an expression pedal or Quickpot binding, you're into dramatic DJ-style filtering and synth-wah effects.

Built for bass, but great for guitar. Low Cut high enough for thin-DI tricks, High Cut low enough for dub-style filtering. It might be all the tone shaping you need.

Features

• Independent Low Cut (high-pass) and High Cut (low-pass) in a single block
• Five slopes on each filter — off, 12, 24, 36 or 48 dB/oct: a gentle, flat-passband rolloff at 12, surgical hard cut at 48
• Filter design derived from Cognate Kinetic
• Emphasis on each corner for musical body, bloom, tame or air — proportional-Q bells, never clinical resonance, and active even with the filter set to Off
• Warmth — anti-aliased, level-compensated tape saturation that adds analogue character without lifting your level; bit-clean at zero
• Sweep the cutoff from an expression pedal or Quickpot binding for DJ-style filter and synth-wah effects
• Phase invert and output trim built in
• Built for bass, great for guitar — Low Cut reaches high enough for thin-DI tricks, High Cut low enough for dub filtering

Uses

• Gentle framing of a DI's frequency range — rumble off the bottom, finger noise off the top
• Thin-DI tricks — a hollow, midrange-only voice to sit over a sub layer
• Dub-style filtering — pull the High Cut down low for a smooth sub roll-off
• Taming post-distortion fizz with steep 36 or 48 dB/oct slopes
• Scooping body or blooming low end with Emphasis, with or without the filter engaged
• Dramatic DJ-style filter sweeps and synth-wah from an expression pedal or Quickpot
• Subtle tape thickening on a master DI with Warmth

Category

EQs, Filters & Dynamics

Channels

Mono in / mono out

CPU

0.2% average · 0.4% max

Version

1.0.0 · 03/06/2026

What's new

Initial release.

Manual

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