Decided to do another playthrough of this after a couple of years, but I can't seem to get any game audio what so ever. Intro videos before the game reaches the main menu have audio like normal.

Every other game/software I use has audio like normal with no issue, including other Source Engine games. I only have a single audio device connected and enabled on my PC, I thought it might be that at first. There is nothing external or internal that I can see that would cause the game to be muted or lack any audio. Also cant get the dev console to work for some reason (it is enabled) to try and play around with commands to see if I could sort it that way.