DSSI is an audio plugin API for software instruments and effects. It is based on the LADSPA plugin API, the ALSA sequencer event types, and OSC communications with custom GUIs.

DSSI is also an early variant of the SCSI disk drive interface, manufactured by DEC and appearing in many late 80's and early 90's VAX and DECsystem servers.

Digital Storage System Interconnect 1.55.0 Megabytes/second depending on the adapter