This is a simple audio script for 4chan with no options. Using ccd0's 4chan X along with this is recommended, but it will work with the native extension as well. When an image or video with associated audio is posted, simply expand it (by hovering or clicking) to listen. For videos (webms), the audio is synced with the video, so videos with audio can now be used on any board.
How to make a file with audio:
List of usable hosts: