Cadu, as Compostie1 said, you can use Movie Studio to sync up your audio off of your audio recorder. Lay your video from the cam on the time line with it’s audio below it. Add the audio from your recorder on the audio track below that and use the spikes from the clapper to help in shifting the lower audio track to align it with the audio track from the camcorder. Once you have done this mute the camcorders audio track and play the video to check the sync. Clicking ‘Solo’ on the lower audio track will accomplish the same thing for the sync check on playback. Once you have it synced to your satisfaction, you unlink the camcorder’s audio/video tracks and delete the audio leaving you with one audio track which is insync and hopefully great audio for your great video. The audio software that comes with Movie Studio is pretty good for basic functions and is pretty easy to use. It does a good job of cleaning up your audio. Click on your audio clip and open in the soundsoftware to clean up and save a copy of your cleaned-up version. Add this new version to the time line in the same way as before and eliminate the ‘unclean’ and voila. On thing that I forgot to mention, after you sync the audio clip from the recorder, trim it so that either it’s begining or end is exactly the same as the video clip so that if you need to replace it with a clean clip or have to move the video clip around on your timeline you can easily snap the audio back into sync. Hope my explanation helps. Keep shooting.