Curvessor 2

Curvessor is an audio plug-in that implements a dynamic range processor in which the response curve of each channel is an automatable spline.

Curvessor can be used as a classic compressor/expander, enjoying the freedom and precision that comes with spline editing.

But more specifically, as it allows the authoring of response curves that are not increasing, Curvessor can be used for creative dynamic range processing in sound design.

Features

• The response curves are smoothly automatable splines.
• Optional Mid/Side Stereo processing.
• Forward, Feedback and Sidechain topologies.
• The amount of feedback can be smoothly changed, going from pure forward topology to pure feedback topology and everything in between. (NEW in verison 2)
• Optional RMS and high-pass filtering on the level detector (NEW in verison 2)
• All parameters, and all splines, can have different values on the Left channel and on the Right channel - or on the Mid channel and on the Side channel, when in Mid/Side Stero Mode.
• Dry-Wet.
• Up to 32x Oversampling with either Minimum Phase or Linear Phase Antialiasing.
• VU meter showing the difference between the input level and the output level.
• Customizable smoothing time, used to avoid zips when automating the knots of the splines, the stereo link percentage, the wet amount, or the input and output gains.

Build

Clone with

git clone --recursive https://github.com/unevens/Curvessor

Curvessor uses the JUCE cross-platform C++ framework.

You'll need Projucer to open the file Curvessor.jucer and generate the platform specific builds.

Supported platforms

Curvessor is developed and tested on Windows and Linux. It may also work on macOS, but I can neither confirm nor deny.

VST and VST3 binaries are available at https://www.unevens.net/curvessor.html.

Submodules, libraries, credits

• The oversimple submodule is a wrapper around two resampling libraries:
  • HIIR by Laurent de Soras, "a 2x Upsampler/Downsampler with two-path polyphase IIR anti-aliasing filtering".
  • r8brain-free-src, "an high-quality pro audio sample rate converter / resampler C++ library" by Aleksey Vaneev.
• audio-dsp, my toolbox for audio dsp and SIMD instructions, which uses Agner Fog's vectorclass and Boost.Align.
• gamma-env: "DSP S-curve envelope signal generator", by Aleksey Vaneev. Curvessor uses a SIMD optimized version of gammaenv that I wrote specifically for it. See the files audio-dsp/adsp/GammaEnv.hpp and audio-dsp/adsp/GammaEnvMacro.hpp.

Curvessor is released under the GNU GPLv3 license.

VST is a trademark of Steinberg Media Technologies GmbH, registered in Europe and other countries.

Version 1

For version 1, see the branch version-1.