https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221509
Patches look a bit scary because their coding style is very loose. They hardcode 'make' and optimization flags in Makefiles a lot, etc.
It also requires a specific version of llvm. Other versions don't work.
Faust, though, implements a new approach to digital sound processing with a special language, compiled into executables of various kinds that are immediately able to convert sound without any third-party libraries.