Yo guys, I noticed that alot of people I know that plays source, including myself, was having this problem with their volume of mumble or vent turning down once cs source ingame mic is used. I figured out how to fix it this morning out of luck lol.nd
Note: This is for people using realtek and windows 7.
Right click on the orange realtek icon in the bottom right corner of ur taskbar.
Select Audio Devices.
Select the Communications tab.
Select "Do nothing".
If you read what the communications tab says, it explains that when a phone is used on the internet, windows detects it and turns down all other sound devices.
Mine was selected on 80%, which is how much sound was being decreased after using cs source ingame mic.
Selecting Do nothing should obviously fix our problem because windows thinks that using ingame mic in source is a type of telephone.
This helped myself and a mate already, hopefully helps out who ever had the problem the other night (boothzke i think) etc.
Thanks all, np.
<3 Knfz