Tutorials Audio Production & Plugins

Free Audacity Plugins Guide | Essential VSTs, Nyquist & Usage

Audio Production · ~16 min read

A 1960s mid-century comic book style editorial illustration depicting audio producers operating Audacity waveform displays, dynamic EQ controls, and loudness meters.

Overview

Audacity has evolved beyond a basic audio editor into a powerful production tool with support for real-time VST3, AU, LV2, and Nyquist plugins. While native tools handle simple trimming and volume adjustment, third-party free plugins add professional-grade dynamic EQ, analog tape saturation, AI noise suppression, and precise LUFS loudness metering. This guide details the top free plugins compatible with Audacity and provides step-by-step instructions to install and get the best results from them.

Supported Plugin Formats in Audacity

VST3 / VST2: Industry-standard audio plugin formats supported on Windows, macOS, and Linux. Audacity 3.2+ supports non-destructive real-time VST3 processing.
Audio Units (AU): Apple macOS native audio plugin format. Automatically scanned from System Library paths.
Nyquist (`.ny`): Lightweight LISP-based scripts designed specifically for Audacity. Ideal for specialized tasks like mouth click removal, de-essers, and vinyl restoration.
Intel OpenVINO AI Modules: Free open-source deep-learning modules for local AI noise suppression, stem separation, and auto-transcription on Windows/Linux.

Top 5 Free Audacity Plugins & Usage Instructions

Tokyo Dawn Labs. TDR Nova (Parallel Dynamic EQ)

Best For: Taming harsh vocal sibilance (3 kHz, 7 kHz) and boominess (200 Hz, 350 Hz) dynamically without dulling the overall voice when static.

How to Use in Audacity: Add TDR Nova to the Real-Time Effects sidebar. Set Band 3 to 3.5 kHz with a narrow Q. Enable the Threshold button so the EQ only cuts when harsh vocal peaks exceed the threshold level.

Klanghelm. IVGI (Harmonic Saturation)

Best For: Adding analog warmth, body, and subtle harmonic weight to thin USB condenser microphone recordings.

How to Use in Audacity: Place IVGI on your vocal track after EQ. Set the mode to Soft Tonal and turn the Drive knob to +2 dB or +3 dB. This fills in weak low-mid frequencies naturally.

Youlean Loudness Meter 2 (LUFS & True Peak Meter)

Best For: Measuring Integrated LUFS, Short-Term LUFS, and True Peak levels to hit target broadcasting standards.

How to Use in Audacity: Load Youlean as the final plugin in your master FX chain. Play back your track to measure integrated loudness. Target -16 LUFS for podcasts and -14 LUFS for YouTube video exports.

Audacity OpenVINO AI. Noise Suppression & Music Separation

Best For: Removing heavy background HVAC noise, street rumble, or separating dialogue from background music locally on your device.

How to Use in Audacity: Install the OpenVINO plugin suite. Highlight your audio track, go to Effect -> OpenVINO Deep Learning Effects -> OpenVINO Noise Suppression, and run processing. It suppresses ambient noise without metallic comb-filtering artifacts.

Paul Stretch & Nyquist De-Clicker

Best For: Removing mouth saliva clicks, lip smacks, and vinyl pops from spoken-word voiceovers.

How to Use in Audacity: Copy `DeClicker.ny` into Audacity's `Plug-Ins` directory. Open Effect -> Plugin Manager and click Enable. Select dialogue audio and run De-Clicker with a sensitivity of 2.0 to clean up mouth noises automatically.

Recommended Vocal FX Chain Order in Audacity

For the cleanest spoken word or podcast vocal sound, stack your free plugins in this exact sequence:

Noise Reduction / Suppression: Clean background hum and ambient room noise first.
High-Pass Filter (Low Cut): Cut unnecessary sub-bass rumble below 80 Hz using native EQ or MEqualizer.
Dynamic EQ (TDR Nova): Control harsh resonances and boxy frequencies dynamically.
Harmonic Saturation (Klanghelm IVGI): Add subtle warmth and presence.
Limiter & Loudness Meter (Youlean): Prevent clipping (set True Peak ceiling to -1.0 dBFS) and verify final -16 LUFS target.

Practitioner Troubleshooting Checklist

If VST3 plugins do not appear after installation, navigate to Effect -> Plugin Manager, click Rescan, and filter status by "New" or "Disabled".
Ensure you match plugin bitness: 64-bit Audacity requires 64-bit VST3/AU plugins.
Use Audacity 3.2+ Real-Time Effects sidebar for non-destructive previewing instead of permanently rendering effects onto raw audio files.

Where This Fits

This guide covers one specific part of mixing and mastering. The wider picture. The full mix workflow from gain staging and balance through panning, bus processing, and knowing when to stop, is in Mixing a Full Song: From Rough Levels to Final Bounce, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.