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pulseaudio equalizer

The system-wide Pulseaudio equalizer developed by psyke83 now has its own Ubuntu Launchpad PPA, for easy installation and updates.

To add the PPA, paste this in a terminal (Karmic and Lucid only!):

sudo add-apt-repository ppa:psyke83/ppa

And then install it:
sudo apt-get update && sudo apt-get install pulseaudio-equalizer

Please note that this equalizer uses the LADSPA sound processing functionality of PulseAudio. For an implementation which does not rely on LADSPA processing, see THIS.

For more info and support on the PulseAudio System Wide Equalizer, see its thread @ ubuntuforums.

Update: the PPA in this post does not have packages for Ubuntu 10.10 and manually installing the .deb from this PPA in Ubuntu 10.10 will not work due to a bug. But I've uploaded a fixed package for Ubuntu 10.10 Maverick Meerkat to the WebUpd8 PPA. See: Download Pulseaudio System-Wide Equalizer Fixed .deb For Ubuntu 10.10 Maverick Meerkat