Snd is a sound editor modelled loosely after Emacs. It can be customized and extended using either s7 (included in the Snd sources), Ruby, or Forth. Snd is free; the code is available via anonymous ftp as snd-16.tar.gz.
Snd has a home page and a CVS repository, and is included in PlanetCCRMA.
ver: 16.2 / May 23.2016