I used to have a problem getting my MIC to work on CS. I had a Sound Blaster Audigy 2 ZS Platinum card and was inserting the MIC in the Line-In/Mic 2 jack. There is a problem in certain Steam games that changes the microphone settings to the Mic 1.

Here's the original thread:
http://forums.creative.com/creativel...cending&page=3

The solution, Muvixer:
http://www.muvaudio.com/muvixer/

Do you play games such as Battlefield© 2 or Half-Life© 2? Do you have a Creative SoundBlaster Audigy© (with external box) or another soundcard that the recording device, when playing these games, is reset to "Microphone" even though you actually use a different line such as Line 2? With Muvixer©, you no longer have to worry. Muvixer© allows you to select the line you always want to use and if Battlefield© 2 or any other program changes your recording device, it will automatically be changed back to your specified recording device on a time interval that you choose! Muvixer is freeware.
I hope that helps anyone with problems!

Cheers!