zyn-fusion : Zyn-Fusion User Interface ( https://github.com/mruby-zest/mruby-zest-build )
zynaddsubfx : Software synthesizer capable of making a countless number of instruments ( http://zynaddsubfx.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a fordfrog
For Paludis use this rsync : rsync://gentoo.zugaina.org/fordfrog-portage
If you have a problem : ycarus(-at-)zugaina.org