gtkgep is a realtime guitar effects processor. I suggest the category media-sound. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Created attachment 28340 [details] gtkgep-0.2.3.ebuild
Created attachment 28341 [details] files/pluginspath-fix.diff
Created attachment 28342 [details] files/gtkgep.desktop
I've placed a IMHO corrected ebuild including correction README in URL below: http://trapni-akane.org/projects/gentoo-contrib/ebuilds/media-sound/gtkgep/
The absense of an upstream support (no website, etc) makes me apprehensive about adding this package to portage...