Hi. I'm trying to make a video for YouTube, but when I tried to work on it with VideoPad Video Editor, I couldn't get any sound whatsoever. The video is fine, but I can't hear anything. I've used two MP4 files with sound and I even played an MP3 file, and no sound is coming from any of them. But when I play the video in my video player, the sound is working fine. Am I missing a codec or something? I need to get this video up ASAP. Any help would be greatly appreciated.