Juke Peg is an MP3 decoder/player that is controlled from a socket interface - easily driven from Perl. It supports more than one output device (and can play different tracks to each), and is able to fade-in, fade-out and overlap tracks. The volume, fade-in, fade-out and overlap settings can be set on a track by track basis.

Version 1.9 source
Version 1.9 Debian package
Version 1.8 source
Version 1.8 Debian package
Version 1.7 source
Version 1.7 Debian package
Version 1.6 source
Version 1.6 Debian package
Version 1.3 source
Version 1.3 Debian package
Version 1.1 source
Version 1.1 Debian package
Version 1.0 source
Version 1.0 Debian package