brutefir software package provides software convolution engine, 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 brutefir
brutefir is installed in your system.
Make ensure the brutefir package were installed using the commands given below,
$ sudo dpkg-query -l | grep brutefir *
You will get with brutefir package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | brutefir |
| Version | 1.0o-1 |
| Description | software convolution engine |
| Sub Section | Sound |