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