abx software package provides audio ABX testing software, 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 abx
abx is installed in your system.
Make ensure the abx package were installed using the commands given below,
$ sudo dpkg-query -l | grep abx *
You will get with abx package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | abx |
| Version | 0.0~b1-1 |
| Description | audio ABX testing software |
| Sub Section | Sound |