dplug is a framework for building audio plugins that do realtime signal processing, and its creator has produced several well-sold plugins under the "Auburn Sounds" studio name.
Interesting. That might fit the bill, though I am not completely sure.
Do you happen to know why D has not been accepted into the benchmarks games at debian.net? I heard that D developers contributed D code, but that D was never accepted.
https://github.com/AuburnSounds/Dplug