Actually, your first link shows that the package is not available in the Entropy repository. The reddish-brown colour indicates it is in Portage (Entropy packages are coloured blue), and you'll notice that the text states "source → portage → gentoo" (and notice the "source"). The text for Entropy packages would be "binary → standard → sabayon-weekly", "binary → standard → sabayonlinux.org" or "binary → standard → sabayon-limbo" (and notice the "binary").
So neither the 32-bit nor the 64-bit editions of the package media-sound/abcde are currently available in the Entropy repositories.
If you would like them to be built and placed in the Entropy repository, click on the the link 'Bugs' at the top right of this page and file a request. Alternatively, you could build the package using the Portage package manager if you know how to use it.