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Features:
* Spectral gating and spectral subtraction suppression rule
* Adaptive and manual noise thresholds estimation
* Adjustable noise floor
* Adjustable offset of thresholds to perform over-subtraction
* Time smoothing and a masking estimation to reduce artifacts
* Basic onset detector to avoid transients suppression
* Whitening of the noise floor to mask artifacts and to recover
  higher frequencies
* Option to listen to the residual signal
* Soft bypass
* Noise profile saved with the session

Limitations:
* The plug-in will introduce latency so it's not appropriate to be used
  while recording (23 ms for 44.1 kHz)
* It was developed to be used with Ardour however it is known to work
  with other hosts

WWW: https://github.com/lucianodato/noise-repellent