Plutonium

Pretty sure you can find an answer on the forum (even if it's for another game it can work)
https://forum.plutonium.pw/search?term=no sound&in=titles&matchWords=all&sortBy=relevance&sortDirection=desc&showAs=posts

_DashySZN_ do what is said above, also most servers on bo2, bo1, mw3 and Waw block you from using vpns.