• Geonkick
• The GitHub repository serves as a Homepage.
• It is a really good software synthesizer designed specifically for making drums and other percussion instruments. It works great and is easy to use and a really good choice for making drum sounds in songs.
• Yes indeed. GPL-3.0-or-later
• Link to tarball: https://github.com/geontime/geonkick/archive/v1.9.2.tar.gz

I have a more or less working package and I am willing to step up to maintain this if it gets accepted :)
This will get Solus one step closer to being a audio musicians dream operating system. I have more coming so stay tuned (not in form of package requests though) :D