alsa-tray : ALSA Tray provides a systray icon and a command line interface for setting the volume of the ALSA Mixers. ( http://projects.flogisoft.com/alsa-tray/ )
qmmp-fooui : Foobar-like interface for qmmp ( http://gitorious.org/qmmp-fooui )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a wavilen
For Paludis use this rsync : rsync://gentoo.zugaina.org/wavilen-portage
If you have a problem : ycarus(-at-)zugaina.org