Joermungand [1] filed a request to merge loopauditioneer [2] into loopauditioneer-svn [3]:

Since February 2015, only 32-bit binaries have been made available by the developer. The SVN version will build for both architectures. Thank you.

[1] https://aur.archlinux.org/account/Joermungand/ [2] https://aur.archlinux.org/pkgbase/loopauditioneer/ [3] https://aur.archlinux.org/pkgbase/loopauditioneer-svn/