In audio settings I get a long list of devices, most of them no more used or duplicates.
How can I delete them?
https://ibb.co/2hNk21y

it is written in a database file, located in ~/.pulse which contains the name "device-manager" and ends with .tdb. This being a binary file I am not sure it can be that easily modified, let alone erased, but the Plasma devs for that part will be better suited to answer, I will try to get hold of someone

Mamarok wrote:it is written in a database file, located in ~/.pulse which contains the name "device-manager" and ends with .tdb. This being a binary file I am not sure it can be that easily modified, ...

TDB (Trivial DataBase) can be inspected and manipulated with tdbtool from tdb-tools package. But i don't know if it is safe to delete entiries in the file without side effects

If you don't tick the 'show advanced devices' tickbox you won't be shown advanced devices.

And there you are wrong, the old bluetooth headset I binned 2 years ago still shows, and I don't have advanced devices checked, never had actually.