beep software package provides advanced pc-speaker beeper, 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 beep
beep is installed in your system.
Make ensure the beep package were installed using the commands given below,
$ sudo dpkg-query -l | grep beep *
You will get with beep package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | beep |
| Version | 1.3-4 |
| Description | advanced pc-speaker beeper |
| Sub Section | Sound |