How to sounds, a three step process:
>Have a script extension in your browser: Violetmonkey (recommended), Greasemonkey, Tapermonkey, etc>Install 4chanX (optional, but recommended)>Install a sound script of your choice:>4chan External SoundsThis is the simple, click image, get sound, pluggin. It makes sounds when you expand images. Syncs audio to otherwise silent webms too.
https://greasyfork.org/en/scripts/31045-4chan-external-sounds>4chan Sounds (Playlist)This is one that was made by an /a/non- it throws all the sound media in a separate, floatable media player that doesn't interact with the thread. It comes with plenty of options and is the overall, superior way to listen to soundposts that is still getting updates.
https://greasyfork.org/en/scripts/402682-4chan-soundsYou can use one, the other, or both. They don't interact/affect each other in any way, so I recomend both.
Enjoy sounds on every board.