USFXR
From CCRMA Wiki
usfxr is a C# library used to generate game-like procedural audio effects inside Unity. With usfxr, one can easily synthesize sound in real time for actions such as item pickups, jumps, lasers, hits, explosions, and more.
usfxr is a port of Thomas Vian's as3sfxr, which itself is an ActionScript 3 port of Tomas Pettersson's sfxr.
