Install dssi-dev by entering the following commands in the terminal:
sudo apt update sudo apt install dssi-dev
Header file for compiling DSSI plugins and hosts
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 header file required for compiling hosts and plugins.