FAUST filters

A collection of virtual-analog filters from the FAUST standard library packaged as multi-format plugins via the DPF.

Plugins

All plugins are mono, i.e. they have one audio input and output, unless noted otherwise. They all have two (automatable) parameters:

• Cutoff / center frequency in Hertz (20.0 - 20,000.0)
• Q factor (range varies)

The plugins depend on the host to provide a generic UI to control parameters.

Diode Ladder

A diode ladder 24 dB lowpass filter

Korg 35 HPF

A Korg 35 24 dB high pass filter as found in the MS-10 and early MS-20s

Korg 35 LPF

A Korg 35 24 dB low pass filter as found in the MS-10 and early MS-20s

Moog Ladder LPF

A Moog ladder-style 24 dB low pass filter

Moog Half Ladder LPF

A Moog ladder-style 12 dB low pass filter

Oberheim Multi-mode Filter

A multi-mode, state-variable filter as found in Oberheim synthesizers

This filter has four outputs:

• Bandstop
• Bandpass
• Highpass
• Lowpass

Formats

All plugins in this collection come in the following plug-in formats:

• CLAP
• LADSPA
• LV2
• VST2
• VST3

Compiling

Make sure you have installed the required build tools and libraries (see section "Prerequisites" below) and then clone this repository (including sub-modules) and simply run make in the project's root directory:

$ git clone --recursive https://github.com/SpotlightKid/faustfilters.git
$ cd faustfilters
$ make

Installation

To install all plugin formats to their appropriate system-wide location, run the following command:

make install

The makefiles support the usual PREFIX and DESTDIR variables to change the installation prefix and set an installation root directory (default: empty). PREFIX defaults to /usr/local, but on macOS and Windows it is not used, since the system-wide installation directories for plugins are fixed.

Use make's -n option to see where the plugins would be installed without actually installing them.

You can also set the installation directory for each plugin format with a dedicated makefile variable.

• CLAP: CLAP_DIR (<prefix>/lib/clap)
• LADSPA: LADSPA_DIR (<prefix>/lib/ladspa)
• LV2: LV2_DIR (<prefix>/lib/lv2)
• VST2: VST2_DIR (<prefix>/lib/vst)
• VST2: VST3_DIR (<prefix>/lib/vst3)

Example: make DESTDIR=/tmp/build-root VST_DIR=/usr/lib/lxvst install

To install the plugins only for your current user account, run make install-user.

Again, you can also set the installation directory for each plugin format with a dedicated makefile variable.

• CLAP: USER_CLAP_DIR ($HOME/.clap)
• LADSPA: USER_LADSPA_DIR ($HOME/.ladspa)
• LV2: USER_LV2_DIR ($HOME/.lv2)
• VST2: USER_VST2_DIR ($HOME/.vst)
• VST3: USER_VST3_DIR ($HOME/.vst3)

Note: The given default values for all of the above listed environment variables differ depending on the target OS.

Prerequisites

• The GCC C++ compiler, library and the usual associated software build tools (make, etc.).

  Debian / Ubuntu users should install the build-essential package to get these.

• pkgconf

• The faustpp pre-processor (optional)

The CLAP, LV2, LADSPA, VST2 (vestige) and VST3 headers are included in the DPF framework, which is integrated as a Git sub-module. These need not be installed separately to build the software in the respective plug-in formats.

faustpp and FAUST are only needed to re-generate C++ source and headers files if the FAUST DSP source files in the faust directory are changed.

Author

This software project was put together by Christopher Arndt.

Acknowledgements

The idea for this project was inspired by the poly_filters LV2 plugin collection.

The DSP code is generated from the FAUST sources via the faustpp pre-processor.

The project is built using the DISTRHO Plugin Framework (DPF) and set up with the cookiecutter-dpf-effect project template (with additional customization).