I just found, that Audacious 2.2 has an icecast output plugin, so streaming from EFIKA MX should be easy if you have the same package for Ubuntu/Debian.
czanik@bigone112:~> rpm -qi audacious-plugins-output-icecast-2.2-2.pm.3.2.i586
Name        : audacious-plugins-output-icecast  Relocations: (not relocatable)
Version     : 2.2                               Vendor: 
http://packman.links2linux.de
Release     : 2.pm.3.2                      Build Date: 2010. febr. 28., vasárnap, 04.17.12 CET
Install Date: 2010. márc.  2., kedd, 14.33.54 CET      Build Host: eckhaus
Group       : Productivity/Multimedia/Sound/Players   Source RPM: audacious-plugins-2.2-2.pm.3.2.src.rpm
Size        : 64060                            License: GNU General Public License (GPL)
Signature   : DSA/SHA1, 2010. febr. 28., vasárnap, 04.17.37 CET, Key ID f899f20d9a795806
Packager    : 
detrei@links2linux.de
URL         : 
http://audacious-media-player.org/
Summary     : Icecast Sound Daemon output support for Audacious
Description :
Icecast support plugins for Audacious.
Distribution: main_pm / openSUSE_11.2