libasound2-plugin-equal binary package in Ubuntu Mantic amd64

 Alsaequal is a real-time adjustable equalizer plugin for ALSA. It can
 be adjusted using an ALSA compatible mixer, like alsamixergui or
 alsamixer.
 .
 Alsaequal uses the Eq CAPS LADSPA Plugin for audio processing, actually
 alsaequal is a generic LADSPA plugin interface with real-time access to
 the LADSPA controls (the LADSPA plugin included with alsa doesn't allow
 for real-time controls) but it was developed for and only tested with
 Eq CAPS LADSPA plugin.

Source package