That's a really old project (the last commit is from 6 years ago and the readme mentions Linux 2.6), I wouldn't really trust it. Also running audio operations as root or with sudo (even when sudoing as a regular user) is ultra sketchy, avoid it. If you must use a dedicated daemon try this instead, at least it's actively maintained.
What version of Manjaro are you using? Most desktop environments have a pretty good shortcut manager bundled with them, try using that instead.
Sheerpython reacted to Sauron in Setting up a second keyboard as a soundboard on linux
