Growl Audio gFractorgFractor Multi-mode Spectrum Analyzer & Oscilloscope gFractor is a multi-mode spectrum analyzer and oscilloscope plugin for music producers, mixing engineers, and mastering engineers who need an accurate picture of what's happening across the stereo field — not just left and right, but mid and side, and tonal versus transient content. Built on the JUCE framework in C++17, gFractor combines a configurable real-time FFT display with a tempo-synced oscilloscope, full stereo metering, and an A/B reference workflow in a single window. The audio path is fully realtime-safe: no allocations or locks occur on the audio thread. Three Channel Modes The same generic Primary / Secondary abstraction is used across three analysis modes, so the workflow stays consistent no matter what you're inspecting: Mid / Side — separate the mono centre from the stereo sides. Left / Right — traditional per-channel view. Tonal / Transient — split the signal by content type, with an adjustable transient time constant (0.1–10 ms). Spectrum Analyzer Configurable FFT order from 1024 up to 16384. Overlap from 2x to 8x. Adjustable decay and spectral slope. Infinite peak hold. Freeze. Loadable / savable target curves for spectrum comparison. Right-click-drag Audition Filter for precise bell-filter isolation of any frequency region. Oscilloscope View Tempo-synced time-domain display. Optional spectral colouring of the waveform. Reference Mode Sidechain-fed A/B comparison with ghost overlay. Momentary reference via held modifier key, for quick before/after checks while mixing. Stereo Metering Goniometer. Phase correlation meter. Width-per-octave display (10 bands), to see exactly where stereo width lives in the spectrum. Workflow Three themes: Dark, Light, and Balanced. Preset system with save, load, rename, and dirty-state tracking. Full keyboard control — every major feature has a shortcut, including channel-mode cycling (Tab), view toggling (V), reference (R / Ctrl), freeze (Z), peak hold (H), target curve (T), fullscreen (W), and one-key cycling through slope, decay, overlap, and FFT settings. Formats VST3 (Windows, macOS, Linux). AU (macOS). System Requirements MacOS 10.13 or later (Intel and Apple Silicon, universal binary). Windows 10 or later (64-bit). Linux (64-bit, VST3). Read More