<_< I am not sure I am the only one who has experienced this but I lose sound completely (mic and headphones) when playing any of the steam games.
It seems to be related to 5.1 (and even 4 speaker setting) within windows. Here are some tips how to sort the problem
Sound fix (http://steampowered.custhelp.com/cgi-bin/steampowered.cfg/php/enduser/std_adp.php?p_faqid=303&p_created=1104468231&p_sid=iZyIiZzh&p_lva=&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MzAmcF9wcm9kcz0wJnBfY2F0cz0wJnBfcHY9JnBfY3Y9JnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfbmwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD1zb3VuZA**&p_li=&p_topview=1)
Sad "hope the crap works now" ako
Sheepy was having problems aswell.
I must say that lately my sound goes away for 5 seconds and then it's back. I recon it's my headset though, it's getting old.