ghostess software package provides A graphical DSSI plugin host, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ghostess
ghostess is installed in your system.
Make ensure the ghostess package were installed using the commands given below,
$ sudo dpkg-query -l | grep ghostess *
You will get with ghostess package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | ghostess |
| Version | 20120105-1+b1 [armhf], 2012010 |
| Description | A graphical DSSI plugin host |
| Sub Section | Sound |