gwc software package provides Audio file denoiser, 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 gwc
gwc is installed in your system.
Make ensure the gwc package were installed using the commands given below,
$ sudo dpkg-query -l | grep gwc *
You will get with gwc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | gwc |
| Version | 0.21.19~dfsg0-5 |
| Description | Audio file denoiser |
| Sub Section | Sound |