Announcement: ATKSideChainCompressor 2.0.0 and ATKSideChainExpander 2.0.0

I’m happy to announce the update of the side-chain stereo compressor and expander based on the Audio Toolkit. They are available on Windows and OS X (min. 10.8) in different formats.

These stereo plugins can work on two channels, left/right or middle/side, possibly in linked mode (only one set of parameters), and can be set up to mix the input signal with the compressed signal (serial/parallel compression). The side chain channels can be used to steer the gain stage (the same setup will be used, right/left or middle/side), depending on the switch on the top right of the plugins. The same coloration stage than ATKColoredCompressor and ATKColoredExpander are used here.

This effectively makes ATKStereoCompressor obsolete, as the compressor can be set up in the same conditions as ATKStereoCompressor.

These new versions have more parameters than the previous ones, which means that the parameters used in a project with the former version won’t be loaded in the same way for these new versions.


The supported formats are:

  • VST2 (32bits/64bits on Windows, 64bits on OS X)
  • VST3 (32bits/64bits on Windows, 64bits on OS X)
  • Audio Unit (64bits, OS X)

Direct link for ATKSideChainCompressor.
Direct link for ATKSideChainExpander.

The files as well as the previous plugins can be downloaded on SourceForge, as well as the source code.

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7 thoughts on “Announcement: ATKSideChainCompressor 2.0.0 and ATKSideChainExpander 2.0.0

    1. Hi,
      Thanks! I’ve ditched the internal sidechain version (previously called ATKStereoCompressor), as there is a switch to go from internal to external. By default, it’s internal sidechain.

      1. Thank You for the nice plugin!
        I think the OP was asking for some kind of internal hipass filter so that the compressor would only work above given frequency. It would be helpful. But even right now it is very nice compressor!

  1. Hi Matthieu,

    ATKSideChainCompressor looks really interesting. Could you explain how to use a second track as sidechain input ?


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