calf-ladspa software package provides Linux Multimedia Studio - Calf LADSPA plugins, 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 calf-ladspa
calf-ladspa is installed in your system.
Make ensure the calf-ladspa package were installed using the commands given below,
$ sudo dpkg-query -l | grep calf-ladspa *
You will get with calf-ladspa package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | calf-ladspa |
| Version | 1.1.3-5 |
| Description | Linux Multimedia Studio - Calf LADSPA plugins |
| Sub Section | Sound |