dxt

So i have google this and also open an ticket with firestrom and yet i have got no solution for this. so when ever i start any viewer (and i tested the all) as soon as i enter the second life my system sounds just drops down really low. All my sounds are at 100% but no matter what as soon the viewer starts the sounds gets dropped. When i close the viewer the sounds goes back to normal so i know something in all the viewer is messing with the sound. People suggested me to check my enchnatment which i did but that is not the issue and i cant seem to figure out what is the real issue. Any help will be appreciated.