[kotage]

Yes, I read the sticky about what addons can't do. I simply hope that this is not a change or modification of sound, therefore it could be possible. Is it?

Ideally this addon would allow me to change the speed with a shortcut or a UI element that would appear during conversations (it is only needed for conversations).

Often the speech of characters is unreasonably slow, which becomes very apparent when a good voice actor suddenly makes you forget about how fast he's talking.

Alternatively: if this is not possible, the second best thing would be an addon that can mute voices ONLY, at the press of a button. Then I can quickly read the text without losing all the ambiance.