Audacity
Audacity is freean eneasy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. Audacity is free, open source software to edit your audio.software.
download: https://www.audacityteam.org/download/
getting started:
more help: https://support.audacityteam.org/
Beware! Using Audacity to edit your source files is DESTRUCTIVE meaning any adjustments made to your file are permanent. Therefor, good practise is to work in a copy of your original file.