4chan media player
http://dnsev.github.io/4cs/
 
Don't post the link directly because it'll ban you.
 
It plays embedded sounds and video and has a built in embedder so you can make them yourself.
 
1)Check the Sounds box in the quick reply window
2)Select image
3)Select .ogg for sound(s)
Note: You can add multiple sounds, but the total filesize can't be over 3mb.