XMMS LADSPA an Effect Plugin for XMMS that provides (some of)
the power of the Linux Audio Developer's Simple Plugin API (LADSPA) to your
everyday MP3 and all-around media player.

With XMMS LADSPA you can use any number of audio processing plugins 
written to the LADSPA specification, 

WWW: http://www.ecs.soton.ac.uk/~njl98r/code/audio/