DJ Py is a jukebox daemon, who lets you rate your songs and crossfades between them. If you dont want to constantly supervise your xmms, this is the solution
Equalsa is An equalizer for ALSA. Supports command line and GUI interface. Works by automatically editing the .asoundrc file. requires: Python and swh-plugins package. For GUI: PyGTK, Glade
JackFX is a python module for midi control and realtime audio effects processing built using the Jack Audio Connection Kit. Effects are stackable, and can be chained in any configuration with only a few lines of python code.
MixMasta P is a Python script designed to ease the process or making mix CDs, or other works involving playlists. It will read a playlist and copy/convert/normalize all tracks automatically.
Implementation of Yamaha's MIDI control protocol for their digital consoles.