GNM-23 — VST Delay & Reverb Plugin

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VST3 Analog Character All Platforms

The Authentic Sound of Analog Delay

GNM-23 faithfully emulates a legendary 1981 BBD delay/reverb unit. Real bucket brigade character with multi-chip modeling, compander circuit, and analog clock artifacts. Your sound, your machine.

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Works with every major DAW

Ableton Live Logic Pro Reaper FL Studio Pro Tools Cubase Studio One Bitwig
Demo Interattiva

Try the GNM-23 interface

Drag the knobs to explore the plugin controls. This is a faithful replica of the real interface.

▸ UI Evolution
Drag knobs up/down · Shift for fine control · Double click to reset v1.0.2

Drag knobs up/down · SHIFT for fine control · Double-click to reset

Why GNM-23

Built different from every other delay plugin

5-Chip BBD Chain

Real bucket brigade modeling with progressive bandwidth reduction, chip-specific noise floor, and analog clock artifacts per stage.

Compander Circuit

Authentic 2:1 compression before BBD and 1:2 expansion after. Models the signal-dependent breathing and pumping of the original hardware.

Echo & Reverb Modes

Dual operating modes from the original hardware. Echo with rhythmic repeats, Reverb with asymmetric multi-tap mixing for lush spatial effects.

Self-Oscillation

Push the Regeneration knob past unity for authentic self-oscillation — spiraling feedback tamed by analog soft saturation.

DAW Sync + Divisions

Lock to your DAW tempo with musical divisions (1/4, 1/8, triplets, dotted, swing). Or go free with the original continuous delay knob.

Neural Network Ready

RTNeural integration slot for trained analog character models. Capture the exact nonlinearities of a specific vintage unit.

How It Works

From original schematics to your DAW

1

Insert on Any Track

Load GNM-23 as a VST3 plugin on any track. Mono in, stereo out — just like the original 1981 hardware.

2

Choose Echo or Reverb

Echo mode gives rhythmic repeats with adjustable time and feedback. Reverb mode mixes all BBD taps for lush spatial depth.

3

Shape Your Sound

Dial in regeneration, tone, and modulation. Change parameters while playing — the BBD pitch glide responds exactly like the real hardware.

Input
Mono audio signal
Compressor NE570 2:1
BBD Chain
5 chips per lane
Expander NE570 1:2
Output
Stereo mix
Emulazione Circuito

Circuit-Level DSP

Every component modeled from the original schematics

BBD Delay Line

7680 stages, 4 tap outputs, Hermite interpolation

Compander (NE570)

2:1 compress, 1:2 expand, envelope follower

Clock Generator (VCO)

Smooth glide, LFO modulation, RC filtering

Tone Filter

One-pole LP in feedback loop, progressive darkening

Analog Character

Waveshaping, noise floor, HF rolloff per chip

Input Stage

BJT soft clipping, gain control, saturation

Nuovo in RC2

Pannello Advanced DSP

Expandable "ADV" panel with 8 configurable parameters. All defaults match the original VRS-23 behavior.

Tone Filter

5 selectable types: 1-Pole LP, 2-Pole LP, SVF Low Pass, SVF Band Pass, SVF High Pass — plus Resonance control.

Feedback

Potentiometer curve (linear to cubic, continuous) and maximum regeneration level.

Clock Glide

Glide time from 10 to 1000ms — controls the delay transition speed for pitch shift effects.

Character

Feedback color (progressive darkening of repeats), harmonic saturation, and analog character (noise floor + TDA1097 harmonics).

New in v1.0.2

What's new in v1.0.2

First stable release: quadratic depth curve, refined regeneration, and native macOS support.

Mono / Stereo Input

New selector next to the INPUT control: choose between Mono (a single VRS-23 chain faithful to the 1981 hardware) or Stereo (two parallel VRS-23 units with independent per-channel feedback). In Stereo mode the delay opens across the entire stereo field, preserving pan and L/R details without the comb-filter artifact typical of delays that sum to mono. Perfect for panoramic drums, stereo synths and rhythmic loops with movement.

More musical and incisive filters

The multi-mode filter (1-Pole LP, 2-Pole LP, SVF LP/BP/HP) now covers the full audible range 20 Hz – 20 kHz: HP fully open at zero, LP completely bypassed at max. The Resonance knob works across all filter types with a Moog-ladder-style curve that colors without excessive ringing. SVF modes have internal saturation in the resonance loop that makes the sweep "sing" like a TB-303 or H-Delay. The Band-Pass is tighter and present even at low Resonance.

Cleaner high regeneration

At Regeneration above 50% with LP filters, the delay no longer produces that sub drone that sustains itself detached from the track: a passive mitigation typical of the original hardware (coupling capacitors + NE570 chip squelch) is now replicated in the digital emulation.

DAW projects saved correctly

Reopening a DAW project that uses GNM-23, all interface controls — including Echo/Reverb, Mono/Stereo, Sync selectors and Division buttons — return exactly as you left them. No setting "lost" on reopening.

Quality Mode

Three processing levels

Choose the right balance between quality and CPU load.

ECO

Lightweight processing, ideal for sessions with many plugin instances.

Low CPU load

STD

Full processing with all emulated circuit stages.

Balanced

HiFi PRO

PRO

2x oversampling for the highest audio quality. Reduced aliasing artifacts.

Full License only
Interface

Designed for your workflow

Resizable UI

Drag the window corner — from 480px to 1920px. Vector-based graphics.

Bypass Toggle

Disable the effect with one click for instant A/B comparison.

34 Factory Preset

Curated presets plus unlimited user preset storage.

Sincronizzazione DAW

Delay e LFO si agganciano al tempo della DAW con divisioni musicali.

Stato Licenza

Color indicator: green (active), orange (trial), red (expired).

Cross-platform

VST3 + Standalone for Windows, macOS (Universal), and Linux.

Technical Specifications

Lightweight plugin, minimal CPU usage

Component Specification Detail
BBD Chips 10 x TDA1097 7680 stages
Compander 2 x NE570 2:1 / 1:2
Sample Rate 44.1 - 192 kHz Full range
Latency 0 samples Zero latency
CPU Usage < 1% Lightweight
RTNeural

RTNeural Integration

Neural network slot for trained analog character models

Analog Character Model

Train a small LSTM network on real hardware recordings to capture exact nonlinearities. Input: clean signal, output: BBD-processed signal.

Future: Per-Unit Modeling

Each vintage unit sounds slightly different due to component tolerances. Capture YOUR specific unit with machine learning.

< 0.1ms
site.features.latency
LSTM(8) + Dense(1)
Input vector
Audio thread safe
Threading

Simple, transparent pricing

Start free, upgrade when ready. No subscriptions.

Free Trial

€0 / 90 days

Full-featured 90-day trial. No credit card required.

  • All DSP features unlocked
  • All factory presets
  • Echo + Reverb modes
  • DAW sync + musical divisions
  • Self-oscillation
  • RTNeural neural coloring
  • 30+ factory presets
  • 1 device
  • 90-day full trial
  • After trial: 60s per session limit
  • 1 device
  • HiFi Quality 2x Oversampling (Full License only)
Start Free Trial
BEST VALUE

Full License

€49,00 / one-time

Perpetual license for v1.x — all minor updates included.

  • Everything in Free, plus:
  • No time limit — perpetual
  • 3 devices
  • All future v1.x updates
  • 3 devices
  • HiFi Quality — 2x Oversampling
  • Lifetime v1.x updates
  • Major version upgrade: €19
Buy Full License — €49,00

System Requirements

GNM-23 runs on Windows, macOS, and Linux

Minimum

CPU Intel i5 / AMD Ryzen 5
RAM 8 GB
Disk 5 GB free
OS Windows 10+ / macOS 11+ / Ubuntu 22.04+

Recommended

CPU Intel i7 / AMD Ryzen 7
RAM 16 - 32 GB
Disk SSD with 10 GB free
OS Latest version of your OS

Compatible DAWs

DAW Minimum Version Format
Ableton Live 11+ VST3 / AU
Logic Pro X+ AU
Reaper Any VST3
FL Studio 20+ VST3
Pro Tools 2021+ VST3
Cubase / Nuendo 12+ VST3
Studio One 6+ VST3 / AU
Bitwig Studio 4+ VST3
FAQ

Domande Frequenti

GNM-23 is a VST3 plugin that faithfully emulates a legendary 1981 analog BBD (Bucket Brigade Device) delay and reverb unit. Every circuit component is modeled from the original hardware schematics — 10 BBD TDA1097 chips, NE570 compander circuit, VCO clock generator, and analog tone filter.
RTNeural is an open-source neural network inference engine optimized for real-time audio. GNM-23 includes an RTNeural slot for loading trained analog character models.
Not for audio processing. You only need internet for: license activation (first time), periodic heartbeat (every 30 days), and checking for updates.
The VST3 plugin takes up about 4MB. No additional software, servers, or AI models required.
GNM-23 is a lightweight DSP plugin. It uses less than 1% CPU. No GPU required. Works on Windows 10+, macOS 11+, and Linux.
Bucket brigade devices store audio as analog charges. When you change the clock speed, all the charges shift — creating the unmistakable pitch glide.
Vedi tutte le 18 domande frequenti

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Requires: DAW with VST3 support, 4GB RAM minimum, 50MB free disk space.

Requires: DAW with VST3/AU support, 8GB RAM minimum, 5GB free disk space

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