ronch808 [1] filed a deletion request for soundconverter-git [2]: The build of this package fails. Say that autogen.sh in missing, which it is. So no way to build the package at this point.
[1] https://aur.archlinux.org/account/ronch808/ [2] https://aur.archlinux.org/pkgbase/soundconverter-git/
