Please add that to your original post at the top so the people with more PC experience concerning gameplay and possible audio issues can help you out. As for myself, in case it helps any, try exiting the game, disabling Synapse, and then launching the game to see if it works. A quick google search led me to an old Steam discussion where someone was having an issue with CS:GO and mentioned how Synapse seems to be taking control of the audio from the game for some reason. Unfortunately, there was no resolution in that discussion, but it's worth a shot. If the above doesn't fix it for you, please do update your post as I mentioned above with the full information. Along with that, you may also want to post your issue on the Razor support site as it may be something to do with a Windows 10 update or a Razor software issue.