Here is a new ebuild for the newest version of sox. The old version has a nasty bug that is updated in this version. I've just copied the old one from 12.17.9 and renamed it along with the appropriate patches from that version.
Created attachment 89742 [details] main ebuild
Created attachment 89743 [details, diff] first patch used by ebuild
Created attachment 89744 [details, diff] second patch used by ebuild
thanks, I skipped this and bumped directly to 12.18.2