Siren – See http://fastlabinc.com/Siren/index.html
The Siren system is a general-purpose software framework for sound and music composition and production; it is a re-implementation of the Musical Object Development Environment (MODE), the software component of the Interim DynaPiano project.
Siren is a collection of about 350 Smalltalk class libraries for building sound/music applications; it is known to work on Squeak running on Macintosh, Windows, and UNIX-based computers with support for MIDI and audio I/O.
The Siren release is available via anonymous Internet ftp file transfer from the directory pub/Smalltalk/Music/Siren on the server ftp.create.ucsb.edu (i.e., the URL of the directory is ftp://ftp.create.ucsb.edu/pub/Smalltalk/Music/Siren). There's a web page describing it at http://www.create.ucsb.edu/Siren
There are several elements to Siren: