Knock Audio KNOCK [WiN-MAC]

• Product: KNOCK
• Developer: Knock Audio
• Version: 1.2.5
• Format: VST3, AAX, AU
• Requirements: Windows 8 or later, macOS 11 or later
• Source: knockaudio.com/shop/knock-plugin

KNOCK is a five-stage drum-processing plugin from Knock Audio, built by producer and sound designer DECAP around the chain heard on his Drums That Knock series. Punch shapes transient attack, Saturate adds selectable harmonic drive, Sub generates a tuned low-end layer under a detected kick, Air adds top-end presence, and Clip pushes level through a selectable hard or soft curve. The plugin ships as a one-time $99 purchase in VST3, AU, and AAX, running on Mac and Windows.

Key Takeaway

KNOCK runs five fixed processing stages — Punch, Saturate, Sub, Air, Clip — in one plugin built specifically for drum tracks and one-shots, not a general-purpose channel strip. Each stage offers a small number of modes rather than deep continuous control, so a producer wanting granular parameter access on any single stage will find KNOCK’s controls simpler than a dedicated single-purpose tool.

One Knob For Attack

Punch works as a transient shaper, amplifying the attack portion of a drum hit to make it snap and cut through a mix rather than sit flat against the surrounding elements. The stage is built around drum loops and one-shots specifically — kicks, snares, claps — rather than sustained or pitched material.

Punch exposes a single control for the effect’s overall amount rather than separate attack-time and sustain-time parameters, so shaping only the very front of a transient independently from its body isn’t available inside this stage — a producer needing that separation reaches for a dedicated transient designer instead. On a loop or one-shot that already carries a sharp, pre-shaped attack, pushing Punch further risks an over-clicky, brittle top end rather than added punch.

Three Grades of Drive

Saturate adds harmonic distortion across three selectable modes — soft, medium, and hard — while compensating for the perceived loudness increase that distortion typically introduces, so switching modes doesn’t also mean re-gain-staging the track afterward. The stage targets 808s, one-shots, and full drum loops, adding harmonic content that a clean digital hit doesn’t have on its own.

Three fixed modes cover soft-to-hard saturation character without a continuous drive parameter between them, so dialing in an intensity that sits precisely between medium and hard isn’t possible inside this stage the way it would be with a continuously variable drive knob. A producer building a specific saturation curve for a signature sound across a whole session gets three repeatable starting points rather than infinite in-between settings.

A Sub Tone Under the Kick

Sub detects when a kick drum is present in the signal and generates a layered sub-frequency tone underneath it, with the pitch of that generated tone set to match the key of the track. That detection-driven approach adds low-end weight to a kick that’s thin or poorly tuned without requiring a separate sub-bass layer recorded or programmed by hand.

Because the stage works from kick detection rather than a fixed trigger point, a drum loop with dense, overlapping low-end hits — stacked kicks, layered 808s, busy breakbeats — gives the detector a harder signal to read than a single, isolated kick hit does. Producers tuning a kick to the key of a beat get a fast way to do it without a separate synth; producers running Sub on already-layered low end are asking the detection to do more work than it’s built for.

Air Without the Harsh Edge

Air adds top-end presence and brightness in two selectable modes, vintage and clean, aiming for smoothness at the high end rather than the harshness a static high-shelf boost can introduce on a drum bus. The stage works as a finishing touch after the other four stages have already shaped the transient, harmonic content, and low end.

Two fixed voicings — vintage and clean — cover the character range of the stage without a continuous tone control between them, so a producer chasing a brightness character between those two references dials in the closer of the two rather than something in between. A drum bus that’s already bright before reaching this stage has less to gain from Air than one starting darker or duller.

Built To Run In Bulk

KNOCK runs light on CPU relative to a five-stage processing chain, which keeps loading multiple instances across a session — one per drum track rather than one shared bus — a realistic option instead of a CPU-budget decision. Factory presets built by DECAP ship with the plugin, giving a starting chain setting per stage instead of dialing all five in from a blank state.

Presets set a starting point across all five stages at once rather than per individual stage, so recalling only the Sub setting from one preset while keeping a custom Punch and Clip setting from elsewhere means adjusting those other stages by hand after loading it. The plugin installs as a one-time $99 purchase with a lifetime license and free upgrades to future versions, rather than a subscription that needs renewing to keep working.

Modes, Not Continuous Knobs

Punch’s single amount control, Saturate’s three fixed modes, and Air’s two fixed voicings share the same underlying design choice: discrete settings tuned to sound right rather than continuous parameters left open for fine adjustment. KNOCK Clipper, the standalone $19 module built from the same clip stage, includes an oversampling toggle for finer harmonic control; the full five-stage plugin’s Clip stage isn’t described with that same toggle.

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