Provides per-band compression with a fixed ratio and adjustable thresholds.

ReaFir is a go-to tool for removing steady-state background noise like computer fans, AC hums, or microphone hiss.

Features a highly accurate, real-time frequency response display.

If you tell me what you're using or the type of audio you need to clean up, I can give you more specific tips on setting the FFT size or threshold levels. Cockos ReaFIR - Review (Denoising)

Includes no copy protection or complex installation requirements. Important Considerations