SPTK is a suite of speech signal processing tools for UNIX
environments, e.g., LPC analysis, PARCOR analysis, LSP analysis,
PARCOR synthesis filter, LSP synthesis filter, vector
quantization techniques, and other extended versions of them.
Sound Orgy is a suite of command line tools for the purpose of sound production and modification as well other misc sound related functons. Sound Orgy consists of components which use command line piping to connect to each other much like patch cords.