Cleansix detects and removes harsh resonances from audio in real time using STFT spectral analysis. It targets the specific frequencies that make tracks sound harsh, boxy or ringy — and pulls them down without dulling the overall tone.Detection• STFT analysis identifies resonant peaks above surrounding spectral energy• Five Focus Bands: Vocal Harsh (2–5 kHz), Cymbal Ring, Box (200–600 Hz), Full Range or Custom• Auto-Threshold calibrates from your source material with one clickSuppression• Surgical mode — fast attack and release for precision• Organic mode — slower smoothing for transparent correction• Mid/Side processing — treat stereo, mid-only or side-onlyAnalysis• Health Score — before/after quality metric with shareable results• Outbreak Mode — full-spectrum resonance visualization with color-coded frequency bands• Lab Report — export a text-based analysis summaryWorkflow• Delta Monitor — hear only what's being removed• Auto-Level automatic gain compensation• A/B compare between two settings slots• Diagnosis Seed — share settings as a compact hex code15 factory presetsAU, VST3 and Standalone — Universal Binary (Apple Silicon + Intel), code-signed and notarized by Apple so it installs cleanly on macOS.Requires macOS 15.0 or later. Requires a 64-bit AU or VST3 host.