These packages are a bit strange in that they install binaries for x86_64 with following PKGBUILD's
arch=('x86_64')
https://aur.archlinux.org/packages/distrho-arctican/
https://aur.archlinux.org/packages/distrho-bin/
https://aur.archlinux.org/packages/distrho-drowaudio/
https://aur.archlinux.org/packages/distrho-highlife/
https://aur.archlinux.org/packages/distrho-hybridreverb2/
https://aur.archlinux.org/packages/distrho-juced/
https://aur.archlinux.org/packages/distrho-tal/
https://aur.archlinux.org/packages/distrho-wolpertinger/
and x86 binaries with these PKGBUILD's
arch=('i686')
https://aur.archlinux.org/packages/lib32-distrho-arctican/
https://aur.archlinux.org/packages/lib32-distrho-bin/
https://aur.archlinux.org/packages/lib32-distrho-drowaudio/
https://aur.archlinux.org/packages/lib32-distrho-highlife/
https://aur.archlinux.org/packages/lib32-distrho-hybridreverb2/
https://aur.archlinux.org/packages/lib32-distrho-juced/
https://aur.archlinux.org/packages/lib32-distrho-tal/
https://aur.archlinux.org/packages/lib32-distrho-wolpertinger/
Both groups install binaries to /usr/lib/lv2/
My understanding of lib32 packages are that they provide 32bit
libaries in a x86_64 environment installed to /usr/lib32,
eg arch=('x86_64') but installing to /usr/lib32
Source code is provided (with a small update) - for which I've created
PKGBUILD's
They correspond to distrho-git which builds separate packages for lv2,
dssi etc.pp.
