I just purchased Power Director 10 Ultra. I just created a video and produce a file using the Ipod/Ipad format which is mpeg4. Now, I can watch the clip on my PC with sound with no problem. However, once I import to my Ipod, I just get video, no audio. Also I hook up the Ipod to my PC and try to play the file this way, no sound also. Any idea why this is happening?