SurferEQ® 2

SurferEQ 2 is a ground-breaking pitch-tracking equalizer plug-in that tracks a monophonic instrument or vocal and moves the selected bands with the music.

Synthesizer filters can track the pitch to maintain the timbre of the sound throughout the instrument’s voices. However, sound equalizers have always been static. While being effective for broad tone-shaping and room resonance correction, standard EQs do a poor job at maintaining the vocal or instrument’s timbre as the music changes.

SurferEQ 2 tracks the pitch of a monophonic instrument or a vocal source and can adapt its bands’ frequencies relative to the music in real-time, maintaining the natural harmonic balance of the sound source and making it possible to shape the source’s timbre relative to the notes being played.

14 Days Trial
Included with Radical Bundle 4


SurferEQ 2 follows the pitch of a monophonic instrument or vocal in real-time and can adjust any of its bands accordingly, thus “Surfing” the sound waves.

SurferEQ 2
Just Blaze
Michael Brauer
Dave Darlington

SurferEQ 2 allows me to easily have a kick drum and a sub-heavy 808 coexist without sacrificing the integrity of either. I won’t mix without it.”

Just Blaze

Multi-platinum Producer

JAY-Z, Beyoncé, Eminem

Surfer EQ


Any of SurferEQ 2’s seven bands can be set to SURF mode to track the pitch of the instrument or vocal source and adjust its frequency relative to the notes being played.

Furthermore, SurferEQ 2’s pitch can be controlled via MIDI notes, allowing its EQ bands to be played using a keyboard, thus creating a unique timbre-shaping musical instrument.

Surfer EQ


We’ve made every effort to preserve the size, energy and transients of the sound source while developing SurferEQ 2’s filters algorithms (No cookbook EQs here!). SurferEQ 2’s analog-like, asymmetric filters sound natural even when pushed to extremes.

In addition to the HIGH-PASS, LOW-PASS, SHELF and BELL-shaped filters, we’ve developed a unique, four-mode HARMONIC FILTER which enables to control the entire harmonic series of an instrument using just a single band of EQ.

Surfer EQ


One of the biggest challenges in designing a real-time pitch-detection algorithm is avoiding octave errors while keeping the algorithm efficient enough for real-time processing. We’ve spent over a year researching and meticulously developing an accurate, real-time pitch-detection engine with virtually no octave errors.


  • Groundbreaking pitch-tracking equalizer
  • Original asymmetric, morphing EQ algorithms
  • Innovative Harmonic Filter
  • Side-chain input enabling external pitch detection
  • Spectral Gate (normal and reversed)
  • 3-mode MIDI control, including an innovative EQ Instrument mode
  • Zero-latency mode
  • Spectrum analyzer and Spectral Level Meters
  • Undo/redo
  • 64-bit internal processing


  • Mac: 64bit Intel Core CPU or Apple Silicon, 8GB RAM, macOS 10.9 or higher
  • Windows: 64bit Intel Core CPU, 8GB RAM, graphics card supporting OpenGL 2.1, Windows 10 or higher
  • Plug-in formats: AAX, Audio Unit, VST, VST3
  • Free iLok account and iLok License Manager (iLok USB key is not required)



A novel two-stage loudness leveler and transparent compressor plug-in. 

Radical® Vox & Bass Duo Special Offer

Whether you're after adaptive vocals timbre-shaping, phat 808 bass mixing or transparent yet powerful dynamics, this Duo's got you covered.




2022-12-29: Version 2.1.2


  • Native AAX Apple silicon support.
  • macOS Ventura qualified.
See all release notes
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