It's not in the repo?
A quick search didn't turn anything up on this specifically (the general issue... not just for this specific package)...
$ pacman -F shnsplit
community/shntool 3.0.10-6
usr/bin/shnsplit
But...
pacman -Ss shntool
$
In other words... nothing.
$ pacman -Syu shntool
:: Synchronizing package databases...
system is up to date
world is up to date
galaxy is up to date
extra is up to date
community is up to date
universe is up to date
error: target not found: shntool
I'm guessing that 'shntool' was moved out of community into AUR but my (quick) search didn't find any confirmation of this. I'm also guessing that the package showing up with 'pacman -F' is some sort of glitch, using outdated info... ?
Can anyone enlighten?