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Old 23rd December 2020
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Software FirComp - FREE ultraclean compressor/limiter

Free compressor with perfect curves

Clean compressor with punchy attack, musical release, and optional lookahead smoothing, for tracks or busses. Zero/low latency and low CPU. Warm distortion at extreme settings.


  • Simple UI and fast workflow
  • Attack stage tuned for punch. True zero attack (same-sample) when "0.0 ms" is selected
  • Dual parallel release stage with musical, highly program-dependent behaviour. Avoids needing to use multiple compressors in series!
  • Easy sidechain filtering options for common mixing situations
  • Optional smooth digital FIR lookahead gain smoothing with perfect timing and no artefacts, resulting in the minimum possible distortion
  • Low CPU DSP code written in a mix of C++ and SSE intrinsics. Insert on every track without a second thought!
  • Fully 64-bit audio path used for all DSP calculations
  • Zero latency with lookahead off. With lookahead on, compensated latency of 64, 128, or 256 samples depending on sample rate (approximately 1.3 to 1.5 ms)

Fircomp is available as:
  • 64-bit VST3 for Windows
  • Intel 64-bit VST3 for Mac OSX
  • Intel 64-bit Audio Unit (AU2) for Mac OSX


Installation simply involves downloading and unzipping the correct file, then copying the plugin file/bundle into the correct folder/directory for your system. Depending on your DAW or host software, you may then need to "rescan" your plugin folder. The folders/directories suggested below are the defaults for most systems, but you may have a different preferred location.
  • Windows VST3: Copy the FirComp.vst3 file to the C:\Program Files\Common Files\VST3 folder.
  • Mac OSX VST3: Put the FirComp.vst3 file inside the /Users/[YOUR USERNAME HERE]/Library/Audio/Plug-Ins/VST3/ folder. Alternatively, from the finder menu bar, click on Go -> Go to Folder... and enter /Library/Audio/Plug-Ins/VST3/ then click on Go, then copy to that location.
  • Mac OSX AU2: Put the FirComp.component file inside the /Users/[YOUR USERNAME HERE]/Library/Audio/Plug-Ins/Components/ folder. Alternatively, from the Finder menu bar, click on Go -> Go to Folder... and enter /Library/Audio/Plug-Ins/Components/ then click on Go, then copy to that location.


That's the copy/paste information from the website. I was fortunate enough to stumble upon this little gem over at KvR audio where the developer posted an early prototype without a UI. Well, now it is ready and has a simple yet effectively little user interface. It's a really clean good sounding compressor that doesn't try to be any analogue model or anything. Instead it uses advanced DSP techniques to be an ultra clean effective compressor (or limiter with ratio set to max) for any tasks where you want to control the dynamics in a transparent and distortion free manner.

This one is a real gem. Almost don't want to share this little secret but it should be known in the world of audio production.