audiotools software package provides Collection of audio handling programs for the command line, 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 audiotools
audiotools is installed in your system.
Make ensure the audiotools package were installed using the commands given below,
$ sudo dpkg-query -l | grep audiotools *
You will get with audiotools package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | audiotools |
| Version | 3.1.1-1+b1 |
| Description | Collection of audio handling programs for the command line |
| Sub Section | Sound |