Part of macOS

`audiomxd`Audio routing

○ Leave it

Routes audio between apps, speakers and headphones.

What it is

Helps decide where sound goes, for example when headphones connect.

If you stop it

macOS starts it again straight away. Leave it.

○ Leave it. Part of macOS, or something that starts again by itself. You never need to close these.

From Procession’s guide, in the words the app shows.