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Matthieu Brucher releases free ATKCompressor and ATKExpander plug-ins for Mac & Win and updates Audio Toolkit to v0.4.0

Matthieu Brucher has announced the release of ATKCompressor and ATKExpander, free mono 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 v0.4.0.

Audio Toolkit is a BSD-licensed audio processing library based on a pipeline concept. This release mainly adds tools for Compressor and Delays design.


  • Added a white noise generator filter.
  • Fixed the delay line filters.
  • Fixed second order EQ Python wrappers.


  • Added a fixed delay line filter (FIR filter) with Python wrappers.
  • Added a universal fixed delay line filter (FIR, IIR and all-pass filter + combinations) with Python wrappers.
  • Added variable delay filters (delay is given on an additional port).


  • Adding compressor elements and the Python wrappers.
  • Fixed Python wrappers by adding default number of port/channels.
  • Added restrict pointer support in all filter that can benefit from this.
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