I'm struggling to get the audio lip synch sorted out on my Iscan. Trying to synchronize using dialogue is difficult for my tiny brain. I know that picture and audio are not in synch but it takes me a while to figure out which is lagging, although I think that it is usually picture. What I'm looking for is a simple percussive test. A slowly repeated single drum beat or an visual sound spike would be ideal. What have other people used to get this correct?