Audacity has a very nice noise cancellation filter. Is it possible, using JACK with ALSA, to pipe live audio through Audacity's noise cancellation filter?

2 Answers 2


No, for real time processing you would want to use Ardour

  • Wow, I've never heard of Ardour. It looks good. It seems like a suped up Audacity, although I'll certainly still use Audacity for its simplicity and power. thanks
    – Geremia
    Jan 13, 2014 at 14:25
  • Doesn't Audacity offer "software playthrough"?
    – Geremia
    Jan 14, 2014 at 19:11
  • Where does Ardour have noise-cancellation?
    – Geremia
    Jan 14, 2014 at 19:23
  • 2
    You can add filters as either pre or post faders (right-click a fader an the top/bottom in the track monitor), they could for example be low-pass or high-pass filters depending on your need, to get rid of "your" noise. In Audacity, first noise is sampled in a quiet section, then this is "subtracted" from your track selection. I didn't think pass-thru is routed through filters, but I may be wrong but this forum probably isn't the correct place to ask.
    – X Tian
    Jan 15, 2014 at 23:17
  • Ardour is great but the "Noise Cancellation" plugin (C*Noisegate - Attenuating hum and noise) doesn't seem to work very well. I'd tried various settings and still haven't been able to cut the hissing out. The best thing I've found so far is Audacity's "Noise Removal" effect but that's not real-time. It may help to remember that White Noise is usually 10kHz and up and Line Feed (low hum) is around 50Hz and lower. Attenuating your samples at those freqs will help reduce noise without much loss of quality Feb 25, 2018 at 12:46

I just found http://www.penguinproducer.com/Blog/2012/01/ladspa-noise-removal/ It lists some plugins to use for noise cancellation

basically: expander->compressor->amplifier->limiter

Works rather well!

  • These are Audacity plugins? Where can I download them?
    – Geremia
    Aug 18, 2016 at 16:25
  • These are ladspa plugins (unix) - and were already installed on my system - I've been using them in combination with "jack-rack" not audacity. For audacity, it has a slightly more advanced sampling noise remover - but it is not realtime.
    – Chozabu
    Aug 20, 2016 at 9:37
  • to add a bit more detail, it seems the Expander and Compressor are the main effective parts - before applying these plugins, I have a constant noisy hiss, after, there is a slight hiss on top of other sounds
    – Chozabu
    Aug 20, 2016 at 9:44

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