У вашего броузера проблема в совместимости с HTML5
In this tutorial I will be (trying) to teach you how to give your mobs custom sounds for your maps. It's pretty complicated, but hopefully this helps to alleviate some confusion :)
If you have trouble understanding the video, I have laid out all the information in the document below:
https://docs.google.com/document/d/1So1y2JEFETFRuMP7Hy6z-6kJkj4k4SKNI-GsA-xO2q4/edit?usp=sharing
I would put the actual information in the description, but brackets aren't allowed :(
I recommend using command block parser if you are really into this kind of thing ;)
http://zipkrowd.com/tools.htm
My Universal Commenting Rules (please read before commenting):
https://docs.google.com/document/d/1-QywGc39wrQNeeYDnPMGCZamvrgXjby9FyBBUdISdas/edit?usp=sharing