Hello. I have recently gotten Sony Vegas 9 pro - but when I import a video or a sound file there's no audio. The video shows - but there's absolutely no sound. And the same goes when I import a music file - the music won't play. I'm very confused - I'm at amateur at this, but I can safely tell you that the audio or the video is not muted. I have installed Codecs - could they be the source of my problem?