I have zero sound as well.
I believe this has something to do with Battleye, i get the following on the Battleye box:
[INFO] Blocked loading of file: "C:\Windows\System32\XAudio2_7.dll"
When i try to load up Argo without Battleye (by clicking the exe and not through steam), i get sound.
I need a way to bypass the block on XAudio2_7.dll to see if this is the case