Having Problems with your sound card after you upgraded to windows 7? this article will help..

When you buy a new computer it comes preloaded with necessary drivers for proper functionality of all of your computers hardware devices. These tend to work well for the most part but after some time passes you may begin to have problems with your sound output. Perhaps you are not receiving sound in certain applications or sound distortion or even sound errors resulting in crashing and/or locking up with a blue screen error.

This will go through the basic steps on setting up a sound card / audio interface in sonar

A sound card is a very important piece of hardware, especially in the multimedia-rich Internet of today. In this case, check your computer to see if it has a sound card or not.

Most sound card problems can be traced to outdated drivers. When they aren't working properly, it's very likely that your sound card won't be able to play back any sound. This audio card depends on functioning drivers for audio playback. So, if you want to continue to enjoy music and movies on your PC, you'll need to update those sound drivers.