DSSI

DSSI (pronounced "dizzy") is an API for audio processing plugins, particularly useful for software synthesis plugins with user interfaces.

DSSI is an open and well-documented specification developed for use in Linux audio applications, although portable to other platforms. It may be thought of as LADSPA-for-instruments, or something comparable to VSTi.

Download DSSI here:

http://dssi.sourceforge.net/download.html