If you are like me I have tons of ISO videos that I use Goodplayer to watch. Sometimes there is no sound at all even though the video plays just fine. The app creator says to swipe your finger to change the Audio Track. Well just doing this doesn't make the sound play. You have to Swipe 1 finger left or right to the next track then...swipe 2 fingers from right to left reversing the video to the beginning and the sound will play if that is the correct audio track. Try this until you find the right audio track for that particular iso. They seem to be all different so until they make a better software for iso streaming this is a minor problem. I was going crazy until I figured this out thinking it was the network or the software, but as it turns out Goodplayer just doesn't or can't play the correct audio track for ISO's. Hope this helps.