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Matthieu Brucher has announced the release of ATKLimiter and the update of ATKCompressor and ATKExpander, free and Open Source mono limiter, compressor and expander plug-ins for 64-bit Mac OS X (10.8 minimum) and Windows (32 and 64-bit) in VST2, VST3 and AU plug-in formats. He has also updated Audio Toolkit to v0.5.0.

Audio Toolkit is a BSD-licensed audio processing library based on a pipeline concept.


  • Renamed slope attribute to ratio for Gain Compressor and Expander Filters.
  • Renamed the Chamberlin filter.
  • Added a StereoUniversalFixedDelayLineFilter that can make mix two channels together with different delay for each channel with Python wrappers.
  • Added a GainLimiterFilter (maximum ratio) with Python wrappers.
  • Added a MaxFilter with Python wrappers.
  • Added a DryWetFilter with Python wrappers.


  • Bug fixes.


  • Added a PipelineGlobalSinkFilter with Python wrapper.
  • Changed the MiddleSideFilter scale (no more dividing by 2 in the code).
  • Additional tools additions (cos generator, offset+volume filter).
  • Added a second order all pass filter with Python wrappers.
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Discussion: Active


20 August 2014 at 5:35pmpascalb

I have some problem to download files. Click on file to download and mmessage "file could not be found..."

Am I alone ?

21 August 2014 at 9:06pmMiles1981

It seems that SF had some issues. I reuploded some files and it should be alright now.

22 August 2014 at 3:01pmpascalb

It's alright now, thanks .

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