These ebuilds come from http://proaudio.tuxfamily.org/wiki.
If you have some problems, go to the official site first.
abGate : LV2 Noise Gate plugin ( http://abgate.sourceforge.net/ )
amb-plugins : AMB-plugins ladspa plugin package. Filters by Fons Adriaensen ( http://kokkinizita.linuxaudio.org/linuxaudio/ )
ams-lv2 : A port of the AMS internal modules to LV2 plugins with VCOs, LFOs, Filters and other modules. ( http://objectivewave.wordpress.com/ams-lv2/ )
balance-lv2 : Stereo balance control with optional per channel delay ( http://github.com/x42/balance.lv2 )
buzzmachines : Machines for Buzztard ( http://www.buzztard.org )
calf : A set of open source instruments and effects for digital audio workstations ( http://calf.sf.net/ )
caps-plugins : The CAPS Audio Plugin Suite - LADSPA plugin suite ( http://quitte.de/dsp/caps.html )
convoLV2 : convoLV2 is a lv2 plugin to convolve audio signals ( http://github.com/x42/convoLV2 )
csa : Control Signal Audio. A group of LADSPA Audio plugins for FM broadcast and more ( http://csa.sourceforge.net/index/index_en.html )
distrho : Open-source project that provides Cross-Platform Audio Plugins using Juce and Qt4 ( http://distrho.sourceforge.net/ )
dssi-vst : DSSI wrapper plugin for Windows VSTs ( http://breakfastquay.com/dssi-vst/ )
eq10q : An LV2 audio plugin implementing a powerful and flexible parametric equalizer ( http://eq10q.sourceforge.net/ )
foo-plugins : foo-plugins for ladspa ( http://code.google.com/p/foo-plugins/ )
frei0r-plugins : Minimalistic plugin API for video effects ( http://www.piksel.org/frei0r )
gst-buzztard : GStreamer plugin used by Buzztard ( http://www.buzztard.org )
hexter : Yamaha DX7 modeling DSSI plugin ( http://dssi.sourceforge.net/hexter.html )
holap : Holborn Audio Plugins: DSSI and LADSPA audio plugins, including DSP effects and a FM synthesizer ( http://holap.berlios.de/index.html )
invada-studio-plugins : Invada ladspa package, contains: Compressor, Filters, Reverb, Input Processor, Tube Simulator ( https://launchpad.net/invada-studio/ladspa )
invada-studio-plugins-lv2 : Invada lv2 package, contains: Delay, Dynamics, Filters, Reverb, Utility ( https://lauchpad.net/invada-studio/lv2 )
ir_lv2 : LV2 convolver plugin especially for creating reverb effects ( http://factorial.hu/plugins/lv2/ir )
ll-plugins : collection of LV2 plugins, LV2 extension definitions, and LV2 related tools ( http://ll-plugins.nongnu.org )
lv2fil : Four-band parametric equaliser LV2 plugin ( http://nedko.arnaudov.name/soft/lv2fil/trac/ )
lv2vocoder : An lv2 vocoder plugin ( http://gna.org/projects/lv2vocoder )
mda-lv2 : LV2 port of the MDA plugins by Paul Kellett ( http://drobilla.net/software/mda-lv2 )
meters-lv2 : A colletion of audio level meters with GUI in LV2 plugin format ( http://github.com/x42/meters.lv2 )
midifilter-lv2 : LV2 plugins to filter MIDI events ( http://github.com/x42/midifilter.lv2 )
mixtri-lv2 : MixTri(x) is a matrix mixer and trigger processor intended to de used with sisco-lv2 ( http://x42.github.io/mixtri.lv2 )
naspro-bridges : A collection of bridges to LV2 which allows use of LADSPA and DSSI plugins in LV2 hosts ( http://naspro.sourceforge.net/ )
nekobee : nekobee, a DSSI TB303 plugin ( http://www.nekosynth.co.uk/wiki/nekobee )
njl-plugins : NJL LADSPA audio plugins/effects ( http://devel.tlrmx.org/audio )
nodelay-lv2 : LV2 audio delay line with latency reporting ( http://github.com/x42/nodelay.lv2 )
omins : Modular audio processing ssytem using JACK and LV2 or LADSPA plugins ( http://drobilla.net/software/ingen )
oscilloscope : An oscilloscope (DSSI-Plugin) ( http://www.student.nada.kth.se/~d00-llu/music_dssi.php?lang=en )
preamp : preamp LADSPA plugins ( http://quitte.de/dsp/preamp.html )
sfxr-dssi : sfxr sound effect generator DSSI plugin ( http://smbolton.com/linux/ )
sineshaper : A monophonic synth plugin that sends the sound from two sin ( http://www.student.nada.kth.se/~d00-llu/music_dssi.php?lang=en )
sisco-lv2 : Simple LV2 audio oscilloscope ( http://x42.github.io/sisco.lv2 )
ste-plugins : STE LADSPA plugins package. Includes stereo panner and width adjuster. ( http://kokkinizita.linuxaudio.org/linuxaudio/ )
triceratops-lv2 : Triceratops is a polyphonic subtractive synthesizer plugin for use with the LV2 architecture ( http://sourceforge.net/projects/triceratops/ )
tuna-lv2 : A musical instrument tuner with strobe characteristic in LV2 plugin formt ( http://github.com/x42/tuna.lv2 )
uli-plugins : Ulis LV2 Insert series plugins. AND NAND OR NOR XOR XNOR NOT and SR, JK, D, T FlipFlops and Latches ( http://sourceforge.net/projects/uli-plugins/ )
vcf : VCF LADSPA plugin filters ( http://www.suse.de/~mana/ladspa.html )
vocoder-ladspa : A vocoder is a sound effect that can make a human voice soun ( http://www.sirlab.de/linux/descr_vocoder.html )
vocproc : LV2 plugin for pitch shifting, vocoding, automatic pitch correctio ( http://hyperglitch.com/dev/VocProc )
wah-plugins : Auto-WAH plugin. ( http://kokkinizita.linuxaudio.org/linuxaudio/ladspa/index.html )
wasp : Wave Sculpting LADSPA audio plugins/effects ( http://linux01.gwdg.de/~nlissne/wasp/ )
whysynth : A versatile DSSI Softsynth Plugin ( http://smbolton.com/whysynth.html )
wsynth-dssi : Wsynth-DSSI, a wavetable synthesizer plugin ( http://www.nekosynth.co.uk/wiki/wsynth )
xfade-lv2 : Stereo DJ X-fade ( http://github.com/x42/xfade.lv2 )
xsynth-dssi : Wsynth-DSSI, a wavetable synthesizer plugin ( http://dssi.sourceforge.net/download.html#Xsynth-DSSI )
zam-plugins : Collection of LV2/LADSPA audio plugins for high quality processing ( http://www.zamaudio.com/?p=870 )
zynadd : synth engines from ZynAddSubFX and pack them in LV2 plugin format ( http://home.gna.org/zyn )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a pro-audio
For Paludis use this rsync : rsync://gentoo.zugaina.org/pro-audio-portage
If you have a problem : ycarus(-at-)zugaina.org