There's a newer version of tse3, 0.3.1. It's the only version with which I was able to successfully build media-sound/noteedit-2.8.0. See http://sourceforge.net/project/showfiles.php?group_id=3700&package_id=3650 . Unfortunately, it doesn't compile with gcc-4.1.1 (though it works fine with 3.4.6). I've put an ebuild for the new version at http://www-scf.usc.edu/~btubbs/tse3-0.3.1.ebuild . Also see http://forums.gentoo.org/viewtopic-p-3496519.html#3496519 .
0.3.1 in cvs.