pulseaudio-equalizer-ladspa - patches, source, etc.
/etc/pulse/system.pa might need 'load-module module-stream-restore restore_device=false'
The files to copy over to your installation are in the folder 'pulseaudio-equalizer'
Leave the ~/.config/pulse/presets folder empty,
otherwise the presets will occur twice !
Dependencies needed to get it working are:
media-libs/ladspa-sdk media-plugins/swh-plugins
otherwise it will (more or less) silently fail