These ebuilds come from http://code.google.com/p/gentoo-china-overlay.
If you have some problems, go to the official site first.
audio-convert-mod : audio-convert-mod is a simple audio file converter supporting many formats ( http://www.diffingo.com )
mac-port : A Monkey's Audio Codec port to *nix ( http://sourceforge.net/projects/mac-port )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a zugaina
For Paludis use this rsync : rsync://gentoo.zugaina.org/zugaina-portage
If you have a problem : ycarus(-at-)zugaina.org