GrowlAudio

Tools that think
like musicians

Audio plugins for electronic music producers. Drum & bass, techno, ambient, noise. We make tools that show you what's happening in your mix — precisely, without decoration.

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What we make

Right now, one plugin. Built because we needed it and couldn't find it elsewhere. More coming.

gFractor spectrum analyzer
gFractor v1.0.0

Spectrum analyzer that does what the name implies — fractures the audio into its parts. M/S analysis, reference comparison, frequency audition. One window.

M/S & Stereo analysis Reference / Ghost mode Click-to-audition Freeze & Hold Note notation w/ cents FFT up to 8192
AU VST3 macOS Win
Free Download Details

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gFractor

Multipurpose spectrum analyzer

AU VST3 macOS 10.13+ Windows 10/11 Free
What it does
M/S

Mid/Side Analysis

The Mid is your kick, your bass, your lead. The Side is your width. gFractor shows you both simultaneously, at every frequency. Phase problems, stereo spread issues, mono compatibility — they're visible before the mastering engineer finds them.

REF

Reference & Ghost

Load a reference track — a finished Metalheadz release, a Fabric recording, last month's rough. Ghost mode overlays it on your spectrum in real time. The gap between what you have and what you're targeting is no longer something you're approximating by ear.

AUD

Audition Mode

Click 63 Hz. Hear your sub in isolation. Right-click and drag to widen the bandwidth. Narrow to a surgical point. This is the part where you stop guessing which frequency is the problem and just listen to it directly — inside the analyzer, no extra steps.

FRZ

Freeze & Hold

Freeze the spectrum at the exact moment the kick peaks. That frame stays locked while the audio keeps running. Move your EQ. Confirm the fix. Unfreeze. Hold pins peak values indefinitely — useful when you need to come back to a reference position.

NOTE

Musical Notation

The cursor tooltip shows frequency in Hz, amplitude in dB, and the nearest musical note with cents deviation. 9.79 kHz is D#9 at −28¢. If you produce music, reading frequencies as notes is faster than reading them as numbers.

FFT

High-Resolution FFT

512 to 8192 FFT size. Configure slope (SLP), decay rate (DCY), and overlap (OVL) independently. The display behaves the way you set it up — not the way the developer assumed you'd want it.

Interface
gFractor — M/S spectrum analysis with frequency labels and cursor readout at 9.79 kHz

Cursor readout

Frequency in Hz · Amplitude in dB · Note name with cents offset. Always visible on hover.

View modes

M/S · Mid · Side · Stereo — one click, spectrum updates without stopping playback.

Band labels

Sub · Low · Low-Mid · Mid · Hi-Mid · High · Air — persistent markers across the full range.

In practice
01 ─ LOAD

Your room is lying to you

Your monitors, your room treatment, your ears after six hours — they're all coloring what you hear. Drop gFractor on the master bus. See the kick against the sub. The 300 Hz buildup. The 12 kHz shelf loss. What it actually looks like.

02 ─ COMPARE

When your ears are gone

It's 3am. You've been in this mix for four hours. Load the reference you've been chasing. Ghost it. The difference is visual now. The low-end comparison stops being a feeling and becomes a fact.

03 ─ FIX

One window, start to finish

Click the frequency. Hear it. Freeze the moment before the change. Apply the EQ move. Confirm the fix. Unfreeze. No switching windows, no context loss.

Specs — gFractor v1.0.0

Format & Platform

Plugin Formats
AUVST3
macOS 10.13 High Sierra+
Windows 10 / 11 (64-bit)
Price Free

Analysis Engine

FFT Sizes 512 · 1024 · 2048 · 4096 · 8192
View Modes M/S · Mid · Side · Stereo
Slope (SLP) Adjustable
Decay (DCY) Fast · Med · Slow
Overlap (OVL) 1× · 2× · 4×
Download

gFractor.
Free.
No strings.

Download, install, open your DAW. It works.

Download gFractor
AU VST3 macOS 10.13+ Windows 10/11 v1.0.0