MarsSeed [1] filed a deletion request for lib32-alsaequal [2]: It's not been updated since 4 years. Nor has it seen any user request for such. I think it's safe to delete. Even its 64-bit counterpart is not in Arch repos. Nothing depends on this on AUR as well.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-alsaequal/
