Install dssi-utils by entering the following commands in the terminal:
sudo apt update sudo apt install dssi-utils
Command-line utilities for sending commands to DSSI plugins
DSSI is an API for audio plugins, with particular application for software synthesis plugins with native user interfaces. . DSSI is an open specification developed for use in Linux audio applications, although it is portable to other platforms. It may be thought of as LADSPA-for-instruments, or something comparable to VSTi. . This package contains the dssi_osc_send and dssi_osc_update utilities which can, for instance, be used to send commands to the DSSI trivial synth plugin.