Most of us are happy with Audacity for our audio-editing needs, but if you need full on pro-quality audio production, Ardour is it <https://www.theregister.co.uk/2020/05/28/ardour_6_release/>. I did try running it briefly once, but like Blender, you really need an introductory tutorial or two to make at least some initial sense of it all--you cannot just dive in blindly and expect to figure it out by messing around.